Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
Nothing tests a backyard flock like a January morning when the temperature drops below zero and every water source in the coop turns to ice. After years of watching hens peck at a frozen nipple line at dawn, I started treating heated waterers the same way I treat any other piece of winter equipment: buy the spec, not the marketing, and match the unit to the flock and the climate. I spent this past winter comparing eight of them, reading owner reports from northern states and Canadian provinces, and watching what happened at five in the morning when the wind came off the open field.
This guide covers the best heated chicken waterers for freezing weather, from complete all-in-one waterers with an integrated heating element to plain heated bases you set a metal fount on. Every product below was evaluated on the same things: the rated low-temperature figure, the wattage and whether it is thermostatically controlled, the capacity measured against real flock sizes, and the honest complaints that show up in reviews rather than on the product page.
One thing worth saying up front, because no competitor page covers it: heated chicken waterers do work, but they are not a set-and-forget fix. Placement, cord routing, ventilation and a backup plan for outages decide whether a unit performs. I have seen a well-rated waterer fail and a plain insulated setup hold on, and the difference is usually down to how the waterer sits in the coop.
The table below is the fastest way to see how these eight actually differ. The single biggest split is not capacity or price, it is whether the heat is built into the waterer or supplied as a separate base plate. That choice determines which water containers you can use and how much of your setup you can keep when you swap equipment.
| Product | Features | |
|---|---|---|
Farm Innovators HB-60P Heated Waterer |
|
Check Latest Price |
Farm Innovators HP-125 Heated Base |
|
Check Latest Price |
Premier 1 All-Season Heated Waterer |
|
Check Latest Price |
Farm Innovators C-50P De-Icer Disc |
|
Check Latest Price |
API 3 Gallon Heated Waterer |
|
Check Latest Price |
Lxheir 13 Inch Heated Base |
|
Check Latest Price |
My Favorite Chicken 28W Heated Base |
|
Check Latest Price |
K&H Thermo-Poultry Waterer |
|
Check Latest Price |
We earn from qualifying purchases. CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED 'AS IS' AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
2-gallon capacity
60-watt thermostatic element
Side-mounted drip-free nipples
12 x 12 x 11 inches
The HB-60P has been on the market since 2011 and carries by far the largest body of owner feedback in this roundup, which matters more than it sounds. A waterer with more than 6,500 ratings is a product where the failure modes are already documented, and where replacement parts and knowledge exist if something goes wrong in February.
In practice it is the one I recommend to most small flocks without hesitation. The 60-watt element is thermostatically controlled, so it draws power only when the temperature demands it, and the removable top means you can refill without wrestling with a frozen lid. The side-mounted drip-free and freeze-free nipples mean the drinking points are not the first thing to seize up.

The honest limitation is capacity. Two gallons is genuinely small, and I saw owners describe refilling it two or three times a day once their flock passed about a dozen birds. If you have more than 15 chickens, this is the wrong shape of product for you even though the heater itself is excellent.
Sixty watts is on the modest end of this list, but wattage alone tells you very little. What matters is whether the thermostat cycles the element instead of running it flat out, and this one does. The result is a base that stays warm without cooking the water or generating the condensation that owners of continuous-run units complain about.
Owner feedback for this model centres on frozen water being a solved problem rather than a daily negotiation, which is exactly what you want from an all-season waterer.
This is where cheap waterers quietly fail. Exposed nipples freeze at the valve even when the reservoir is still liquid, and the birds stop drinking while the tank looks fine. The HB-60P mounts its nipples on the side of the tank where the water column stays in contact with the heated mass, and side nipples also mean the frost-prone water surface stays clear of debris and droppings.
The second small thing: a metal handle lets you hang the unit or set it on the ground as your setup changes. Over a winter with shifting wind direction and changing bedding depth, that flexibility was worth more to me than I expected.

Buy it if you keep 6 to 15 birds, want a self-contained unit with no separate base or bucket to lose track of, and prefer a simple design with a long service history. The removable top and side nipples do more for reliability than any extra wattage would.
Skip it if you run 25 birds or more and are already hauling water across ice. At that scale the refill math defeats you. A 3-gallon or 5-gallon unit, or a heated base under a larger fount, will cut the number of trips far more than a better 2-gallon heater will.
125-watt thermostatic element
Activates below 35F
Rated down to 10F
Fits 3-5 gallon metal founts
If you already own metal poultry founts, this base is the highest rated product in this roundup and the one I would put in the most coops. The HP-125 has been sold since 2006, which means the pattern-matching problem is solved: this thing fits the standard double-wall metal fount that most keepers already have a spare of.
The heating activates automatically below 35F and the manufacturer rates freeze protection down to 10F. Owner reports go considerably further than that, with keepers in Maine, Quebec and the Canadian prairies describing water staying liquid through single-digit nights, and one owner reporting the thermostat still working in an enclosed run at -35F. I would not plan your winter around the -35F claim, but I do believe the 10F rating is conservative.

A heated base separates the heat source from the container. That single design decision means you can move between a 3-gallon and 5-gallon fount as your flock changes, and you can keep using the same base if a waterer cracks or gets stolen. It also means one base can serve two waterers in rotation.
The wide platform, the protective bottom cover that shields the element from dirt and debris, and the lip height that keeps pine shavings out of the water are all details you only notice when the waterer has been sitting in a deep-litter coop for a month.
The cord is the most common complaint, and it is worth solving before you install it. Owners describe a short lead that birds peck at, and in a straw-littered wooden coop that combination deserves attention. Route the cord through metal conduit, keep it off the floor, and use an outdoor-rated extension cord to reach a GFCI-protected outlet.
Second, the surface runs hotter than some owners expect and several caution against using it under plastic waterers. If your fount is plastic, the 28-watt low-voltage base further down the list is a better match. Third, a small number of owners received bases that would not power on until the thermostat was recalibrated in a freezer.

Buy it if you run 12 to 30 birds with metal founts, want the option to swap capacity, and can reach a GFCI outlet with an outdoor-rated cord. The rating here reflects genuinely long service rather than a recent launch.
It is not a complete waterer. You need a fount, and you need somewhere dry to put the combination. Plan that shelf or stand before November rather than in the first hard freeze.
3-gallon capacity
100-watt thermostat,on below 40F and off at 60F
Hinged quick-fill cap
16 ft detachable cord
Premier 1 built this one for people tired of carrying water twice a day in the cold, and the design reflects that single goal. Everything you touch in a January morning is on the outside: a hinged cap, a handle, three recessed nipples, no separate base to hunt for in the dark.
Three gallons serving up to 35 adult chickens is a step change over a 2-gallon unit, and it is the size that makes the refill math workable. Owners describe it as the purchase that ended twice-daily hauling for them.

This unit switches on below 40F and off at 60F. That wider band than most competitors use is deliberate: it warms the water without cooking it, which keeps the plastic reservoir stress-free and reduces the condensation that makes a coop damp.
The 100-watt element sits under a 3-gallon reservoir and, in unsheltered, wind-exposed runs, owners do still report freezing. Placement is the deciding variable, not the wattage.
The hinged quick-fill cap is the detail I value most. With a conventional screw lid, the cap itself freezes and you end up chopping ice with a screwdriver in the dark. This one opens regardless.
Recessed nipples keep the drinking surface inside the reservoir where frost and contamination cannot reach it easily, and the 16 ft detachable cord is what makes this a genuine four-season waterer rather than a winter-only unit. The manufacturer also provides a free replacement cord, which matters more than it sounds when the original gets chewed or lost in snow.

Buy it if you keep 12 to 35 birds, want a single self-contained unit, and prefer to pay once for a design that covers all four seasons. The recessed nipple drinkers also suit keepers who want clean water and are dealing with a confined run.
Watch two things. New birds need a short training period before they reliably use nipples, and older birds with large wattles sometimes prefer an open trough. And if your run is exposed on the windward side, build a three-sided shelter around the unit before the first freeze, because no thermostat compensates for moving air.
150-watt thermostatic element
Teflon coated disc
7.5 inch item length
Drops into existing containers
Not every coop needs a new waterer. If you already run a metal fount or a bucket with horizontal nipples that you know works, a de-icer disc is the cheapest way to make it survive winter, and the C-50P is the version I would pick for that job.
The disc drops into the container, the thermostat energises the element only when conditions require it, and the Teflon coating resists the corrosion that destroys bare metal discs in a wet winter coop. The 150-watt element is the highest output in this roundup, which matters when the disc is sitting in a large volume of water.

This is the product to consider first when your reasoning is spec-driven rather than brand-driven. A flock that already has a proven 5-gallon fount does not need a new 3-gallon plastic waterer just because it is winter. You add heat, you keep the container you know your birds drink from, and you avoid the learning curve of a new nipple system midseason.
Owners who pair a submersible heater with a heated base report that both approaches work well together, and for a large flock a disc in each container with a base under a third is a reasonable layered strategy.
The disc is 7.5 inches long and needs a container deep and wide enough to hold it with water above and around it. In a shallow bucket with a low water line, the disc warms the air pocket rather than the water and you get nothing. Measure first.
Second, a disc prevents freezing; it does not heat water to a drinkable temperature on a very cold morning. The birds will find liquid water, but it will be near freezing. Third, some owners in deep-freeze conditions report the unit not switching on. Keep a second heat source as a backup if you are north of the 40th parallel.

Buy it if you have a nipple-style container or a deep bucket you like, and you would rather spend one accessory than replace a working waterer. The one-year warranty and the Teflon coating make it a low-risk way to test whether heat is really your flock’s winter bottleneck.
Skip it if your container is shallow, if your birds have never used that waterer before winter, or if you need drinkable-temperature water at dawn. For those cases, a complete heated waterer is the better purchase.
3-gallon capacity
100-watt heater pad
Ice-free down to -5F
4-foot power cord
The API 3-gallon is the one I would suggest when a coop is small, the birds are already comfortable, and you want a single unit with no base and no assembly. The 100-watt heater pad sits under the reservoir and is described as evenly distributed, which is the difference between a tank that stays liquid and one with a frozen skin at the top.
The detail that earns this unit its place is the rounded tank top. Birds do not roost over the water, droppings do not land in it, and you are not scrubbing a fouled reservoir every week. The easy-fill funnel design makes topping up fast in the cold.

The stated rating is ice-free down to -5F. That covers most of the continental United States and a good deal of southern Canada, but it stops short of the deep-freeze claims made for some heated bases in this roundup. If your winters routinely hit -15F or colder, pick a product with a lower rated threshold and treat the -5F figure as a hard boundary rather than a guideline.
This product sits at the bottom of the rating range in this roundup at 4.0 stars, tied with the trough-style K&H, with 13% of reviews at one star. That pattern is common in the category and it is worth understanding rather than ignoring. The complaints cluster around the short 4-foot cord and around units used in colder regions than the -5F rating supports.
Reviews also mention the lock-and-dry compatibility, which lets you run the same tank on a conventional non-heated base in summer. If your plan is one waterer year-round, that is a genuine advantage over units with a permanently fixed element.

Buy it for a flock of roughly 8 to 20 birds in a moderate climate, particularly if roosting over the water has been a problem for you. The anti-roost lid and the funnel fill solve real daily annoyances.
Do not buy it as your only defence in a northern climate, and do not buy it if your nearest outlet is more than four feet away. Solve the cord distance first, or choose a unit with a 16 ft lead.
35-watt element
Heats below 35F,stops above 68F
13 inch platform
6.5 ft steel-wrapped cord
The Lxheir base answers a question most roundups ignore: can a lower-output base still do a competent job in a moderate climate? At 35 watts it is the second-lowest output here, and it is one of the few budget options that explicitly works with plastic founts as well as metal.
That plastic compatibility matters more than the wattage. Many cheap bases transfer heat into a metal fount efficiently and do very little for a thin plastic bucket. If your waterer is plastic, this is a low-output base worth considering.

Two details here are better than they have any right to be at this price. The 6.5 ft cord is steel-wrapped and bite-resistant, which addresses the pecking problem that owners raise repeatedly about heated bases. And the thermostat cuts out above 68F, so a warm sunny afternoon cannot produce water hot enough to scald.
The stated rule is simple: heat starts below 35F and stops above 68F. It comes pre-assembled, weighs under 2 pounds, and runs from a standard outlet.
Owners in Alberta and other deep-freeze areas report the element losing out below roughly -10C, and the concave heating surface does not make full contact with every waterer shape, which wastes some of that output. A few bases also stopped heating after roughly a year of seasonal use, so treat this one as a seasonal purchase rather than a lifetime one.
There is one more caution from the manufacturer worth repeating: do not leave an empty plastic waterer sitting on the plate. Heat with no water to carry it can damage the container or the plate.

Buy it if you are keeping costs down, run 8 to 20 birds, use a 3- to 5-gallon fount, and live somewhere winters rarely go far below 20F. The cord design sets it apart from other budget bases.
Look elsewhere if you are in a northern or high-altitude climate, if your water use is high, or if you want a unit you will still be running in five years.
28-watt element
Rated to -20F
Adjustable tabs to 11.8 inches
Low-voltage wall adapter
The safety argument decides this category for a lot of coops, and this base is built around it. It runs on a low-voltage wall adapter, so 120 volts never enters the coop. In a wooden structure with straw or pine shavings and birds that peck at anything that moves, removing mains voltage from the building is a meaningful risk reduction.
Twenty-eight watts is the lowest draw in this roundup, which means it can run off a modest solar setup or a small inverter for a long time. The stated minimum rating of -20F is the most optimistic temperature claim among the bases here, and owners report no problems across multiple units and several winters.

The heat goes up instead of into frozen ground because the base is insulated underneath. That is why a 28-watt unit can hold a -20F claim while a 35-watt unit fails at -10C in an exposed run. Direction of heat flow matters more than raw wattage.
The sliding tabs expand to 11.8 inches, so it fits most 1-gallon pails, 2-gallon and 5-gallon waterers, buckets, and small founts. It also works with quail and pigeon setups, and it makes it a flexible base in this roundup for mixed-species coops.
There is no built-in temperature sensor. The unit runs continuously while plugged in, which is why owners commonly add an external temperature controller such as a TC-3. Budget for that controller as part of the setup rather than discovering the running cost in February.
The upside of continuous running is a surface that stays only lukewarm, with no burn risk to feet or hands. The second limitation: it cannot be used with a hanging waterer without modification, so it needs a floor or shelf. A few owners also reported the cord failing at the plug end after a season or two, so keep the adapter accessible.

Buy it if your coop is off-grid, solar-powered, or somewhere you would rather not run a 120-volt cord through straw litter. It is also a good fit for mixed flocks and for anyone who wants a surface no bird can burn itself on.
Add an external controller, mount it on a solid base rather than hanging a waterer from it, and check the cord and adapter each autumn before the first freeze.
2.5-gallon capacity
60-watt thermostatic element
No-roost top
Spill-proof refill cap
The K&H is a trough-style waterer rather than a nipple drinker, and for a small flock that is an advantage: birds learn a trough immediately, there is no training period, and the spill-proof cap means you can carry it from the sink to the coop without a mess.
The no-roost rounded top keeps birds off the water, and the removable filter ring catches debris before it reaches the trough. At 16 inches square, the base is compact for its capacity, which matters in a small coop where floor space is at a premium.

This is the honest trade-off. An open trough is easier to fill, easier to see, and easier for a beginner to understand, but it collects feather dust, shavings and droppings, so it needs scrubbing on a schedule. A nipple drinker stays clean because the water is never open to the air.
Owners with the K&H describe the maintenance as manageable rather than absent. The base is hand washable with mild detergent, and the filter ring lifts out for rinsing. Plan on cleaning it weekly in deep winter, when birds are more likely to station themselves near the water.
This product sits at 4.0 stars with 11% one-star reviews. Two themes run through the negative feedback: the 2.5-gallon capacity being too small once the flock grows, and the trough needing more cleaning attention than nipple models.
Both are predictable. A 2.5-gallon tank is the smallest complete waterer in this roundup, and a trough will always need more attention than a sealed reservoir. If you have more than about a dozen birds, size up before you buy rather than after.

Buy it if you keep 4 to 12 birds, have beginners in the flock who will not learn nipple drinkers quickly, or want a waterer you can carry back to the kitchen to scrub.
Skip it if you run more than a dozen birds, or if nobody in your household will commit to a weekly cleaning routine. A larger nipple-drinker waterer saves you that chore.
Choosing well comes down to four decisions in order: what type of heater you are buying, how much power you can safely deliver, how much water your flock actually consumes in cold weather, and how cold it gets where you live. Get those right and the model choice takes care of itself.
A complete heated waterer has the element built into the base of the reservoir. Nothing to lose, nothing to match, one unit to store, and you cannot set it up wrong. This is the right choice for most people, especially anyone whose flock changes size.
A heated base is a standalone warming platform. You put a compatible fount on top, and you can move between 3-gallon and 5-gallon containers, serve two waterers in rotation, or recover a container that cracks. It is a flexible and repairable option, and it is the better choice when you already own metal founts.
A de-icer disc drops into the container you already have. It is the cheapest way to add heat to a proven system, with the trade-off that it prevents freezing rather than warming water, and it needs a container with enough depth and water volume to work.
Chickens drink more in cold weather than in summer, and the same flock will empty a container faster than the number on the label suggests. Useful reference points from experienced keepers: about 12 birds on a 10-gallon container ran a full week between fills, while 40 to 45 birds on 3-gallon containers required dumping and refilling every other day.
That spread is the whole argument. A 2-gallon unit suits 6 to 15 birds if you are happy to refill in the morning and again in the afternoon. For 12 to 35 birds, a 3-gallon unit roughly halves your trips. For 40 or more, plan on two units or a larger livestock-scale container rather than one big refill job, because carrying a very full container across ice is its own injury risk.
Wattage tells you what you need to deliver and what a solar setup has to provide, not which product is best. The range across this roundup runs from 28 watts to 150 watts, and all of them will keep water liquid when the ambient temperature is inside their rating.
The number that matters more is whether the unit is thermostatically controlled. A thermostat cycles the element, reduces electricity use, keeps the plastic reservoir cooler, and cuts condensation. A continuous-run base needs an external controller added separately. For extension cords, use outdoor-rated heavy-gauge cord, keep connections off the wet floor, and plug into a GFCI-protected outlet.
Compare stated ratings against your own climate, and be conservative. Ratings across this list run from about -5F for the API unit to -20F for the 28-watt base. If your winters reliably hit -20F, buying a unit rated to -5F means gambling on a mild week.
Owner reports of -22F sustained come from a setup combining a submersible de-icer in a 10-gallon plastic tote with horizontal nipples, and one owner of the HP-125 describes it still working in an enclosed run at -35F. Those are real-world ceilings, not ratings, but they show what a sheltered and correctly sized system can do. If other equipment in your outbuilding struggles with cold snaps, you may find our guide to appliances that freeze up in cold weather useful context on temperature ratings generally.
These eight steps work whether or not you buy a heated waterer, and each one addresses a different way cold water gets to your birds.
1. Add a thermostatically controlled heat source. Either an integrated heated waterer or a heated base under a fount. The thermostat matters because it prevents the freeze-thaw cycling that eventually cracks plastic reservoirs.
2. Size the container for the flock. Refill frequency, not tank capacity, is what determines whether winter is manageable. Twelve birds and forty birds are different problems.
3. Move the waterer off the ground and out of the litter. Heat conducts down and away from the container. A stand, a pallet, or a deep litter setup that keeps the base above wet bedding all help.
4. Block the wind. A three-sided shelter or a windbreak on the exposed side makes a bigger difference than adding wattage. Moving air strips heat off the water surface faster than still air does.
5. Insulate what you do not need to heat. Wrap a plain waterer in a foam cooler, bubble wrap, or pipe insulation with duct tape, focusing on the top and sides. Insulation slows heat loss; it does not replace a heater in sustained cold.
6. Keep the water moving. A small fountain or aquarium pump circulates water and makes freezing harder. A solar fountain pump covers off-grid coops with no wiring.
7. Add a physical anchor to the surface. Owners report that a rock, a brick, or a rubber stopper sitting in the water absorbs heat from the surrounding liquid and gives freezing a place to start that is easier to notice and break up.
8. Keep a manual backup. A second unheated waterer carried in nightly, or a plan to haul hot water during a freeze, is the difference between an inconvenience and an emergency. Some keepers keep a caged light bulb under a terracotta pot, which warms the pot a waterer sits on and is less likely to be pecked than an exposed bulb.
One failure mode deserves its own warning. Nipple lines freeze before the reservoir does. The water can look completely fine while the valve at the drinking point is solid, and the birds go thirsty. If a nipple-style system has frozen solid once, add heat at the base and consider horizontal nipples inside a deeper reservoir.
Every heated waterer puts electricity near water inside a building made of wood and litter. Treating that combination casually is the single most avoidable risk in winter chicken keeping, and keepers raise it repeatedly. A heater element can run hotter than a hot tub, which is exactly the problem: a failure that lands on dry straw has nowhere to dissipate.
Run the cord in conduit or at least in heavy-gauge outdoor-rated cord, keep it elevated and out of reach of beaks, and use a GFCI-protected outlet. Rodents chew heating cables under a waterer, so inspect the cord each autumn and again after any weather event. If you can remove mains voltage from the coop entirely, a low-voltage base is a better choice than any amount of cord management.
There is a second trade-off almost nobody mentions: heated waterers add moisture to the coop. Warm water evaporates, humidity rises, and damp bedding plus cold air is precisely the combination behind frostbitten wattles in breeds like Silkie, Wyandotte and Andalusian. Vent high on the wall, not low, so warm moist air exits while the birds stay in a still, warmer air layer. And a second water source in a non-heated container gives frostbitten birds an unfrozen option.
For power outages, assume the waterer is the first thing to fail. Have a backup plan ready before winter: a second unheated waterer stored indoors and carried out, a thermos of warm water for emergency top-ups, and a known snow route to the coop. Our guide to what to do when lines freeze solid covers the broader cold-weather outage thinking. If your indoor humidity is the other problem, the same cold-snap logic applies to air that freezes in unheated spaces.
Finally, install before the first hard freeze rather than during it. A waterer that arrives the week your temps drop below 20F gives you no time to find a GFCI outlet, cut an extension cord to length, and build a windbreak.
The best chicken waterer for cold weather is a thermostatically controlled unit rated below your local winter low. For most flocks a 3-gallon all-in-one heated waterer or a 125-watt heated base under a metal fount works well, keeping water liquid in single-digit temperatures. Match capacity to flock size and read the stated minimum temperature rating before buying.
Yes, a heated chicken waterer keeps water liquid in freezing weather when its rating covers your climate. Most models hold water above freezing down to about -5F, and better-rated bases claim -10F to -20F. Placement decides as much as wattage: keep the unit off the wet ground, shield it from wind, and keep the reservoir full.
Chickens handle cold better than heat, and well-feathered adult hens can forage in temperatures well below zero. Water becomes the limiting factor far sooner than temperature does. Frostbite risk to wattles rises sharply when temperatures drop below 0F, especially in humid coops, so provide wind protection, dry bedding and an unfrozen backup water source.
Common additions include a rock or brick sitting in the water to absorb heat from the surrounding liquid, or a rubber stopper that moves with the surface. More effective options are a submersible de-icer disc, a heated base, or a thermostatically controlled heated waterer. Insulation wrapped around the outside slows heat loss but will not replace a heat source in sustained cold.
Chickens can survive a day or two without feed far better than without water, and dehydration during cold weather quickly reduces egg production and stresses birds. A hen needs access to unfrozen water every single day, which is why a frozen waterer is treated as an emergency rather than an inconvenience.
Ratings across heated chicken waterers run from about 4.0 to 4.4 stars, which is a narrow and mediocre spread. Rather than trusting stars alone, check three things: whether the unit is thermostatically controlled, the stated minimum temperature rating, and whether owners report a short or peck-prone power cord. Those three details predict winter performance better than the star count.
If you keep a small flock and want one unit that handles itself, the Farm Innovators HB-60P is the pick. It is our choice for most households because it combines a thermostatic element, side-mounted drip-free nipples, a removable top and an unusually long record of owner feedback in this category, and the 2-gallon size is the only real limit.
Go with the Farm Innovators HP-125 if you own metal founts or expect your flock to grow past 15 birds, since it carries the highest average rating in this roundup and lets you move between 3 and 5-gallon containers, which makes it the easiest setup to grow with. Pick the Premier 1 all-season unit when you want a complete 3-gallon waterer for up to 35 birds and would rather handle one object than a base and a fount. Choose the My Favorite Chicken 28-watt base when your coop has no reliable mains power, because its low-voltage adapter keeps 120 volts out of the building. The Lxheir 13-inch base covers moderate climates on a budget, and the API 3-gallon is the compact choice for a small coop where birds roost over the water. If you already have a container that works, the C-50P de-icer disc adds heat without replacing anything.
Whichever one you choose, install it before the first freeze, keep the cord protected and elevated, and leave yourself a manual backup. Warmth keeps your birds laying through January, and the best heated chicken waterers for freezing weather are the ones already working when the temperature drops.