Heated Pet Beds and Water Bowls: What They Cost to Run

If you have an old dog with stiff hips, a cat that follows the sun around the house, or a few strays that live under the porch, you have probably wondered whether a heated bed is worth it, and what it will do to the electric bill. The short answer is that it’s one of the cheapest heaters you can buy. Pet beds run on 4 to 60 watts, about what a single light bulb used to draw, and most of them only warm up when the animal is lying on them.

The expensive mistake is going the other way: leaving a space heater on in the garage or turning the whole house up for the dog. Here is what the common heated beds, bowls and shelters cost to run, which ones are worth buying, and when you can skip the plug altogether.

The short version

• Indoor heated cat beds draw 4 to 6 watts. Even plugged in all year, that is about $6 at $0.17/kWh.
• Outdoor and garage pads draw 20 to 60 watts. Run nonstop, that is $2.45 to $7.34 a month.
• Heated water bowls draw 12 to 60 watts and cycle on and off. Expect a few dollars to about $20 for a winter.
• A 1,500-watt space heater left on overnight for a pet can cost more in a week than a heated pad costs all winter.
• Use pet-rated products, not human heating pads, and plug outdoor gear into a GFCI outlet.

What heated pet products cost to run

Find your real rate by dividing your bill’s total charge by the kWh you used. We use $0.17/kWh as a rough US average, with $0.12 and $0.25 for cheaper and pricier areas.

Cost for a 30-day month if the product drew its full rating around the clock. That’s the worst case: thermostatic beds and bowls run less than this.

The last two rows are there for comparison. A heat lamp clamped over a dog bed draws as much as six medium outdoor pads, and a space heater on high draws as much as 25 large ones.

Heated water bowls over a winter

Bowls are where the numbers vary most, because their thermostats switch the heater on only when the water gets close to freezing. A bowl on a sheltered porch in a mild winter might run a quarter of the time. One in an open yard during a week of subzero wind might run nonstop.

Here is a 150-day season, roughly November through March:

All at $0.17/kWh. These are worked examples, not test results. Put the bowl out of the wind and it will run less. If you want your real number, plug it into a Kill A Watt meter for a cold week and multiply.

Why heating the bed beats heating the room

A 40-watt pad works because it puts its heat right where the animal is, under its belly, and the animal’s own fur and the bed’s foam hold that heat in. A space heater in a garage has to warm all the air in a room that leaks through the door seal, the walls and the slab. Most of that heat goes into the concrete and out the gaps.

The same logic applies inside. If you’ve been keeping the thermostat higher while you’re at work because the old dog shivers, a 13-watt warmer tucked in his bed costs about $1.59 a month even if it never shuts off. Our thermostat setback guide shows what each degree you turn back is worth over a winter, and it’s almost always more than that.

None of this means a pad replaces shelter. An animal sleeping outdoors still needs an insulated, windproof, dry space off the ground. The pad goes inside it.

What to do first

1. Figure out who needs heat. Older, thin, short-haired, small and arthritic pets feel the cold most. A healthy husky in a good doghouse may not need anything plugged in.
2. Fix the sleeping spot before you buy anything. Move the bed off cold tile or concrete and away from drafty doors and windows. For outdoor shelters, raise them off the ground and face the opening away from the wind.
3. Try a powerless option for indoor pets. A self-warming pad or a microwavable heat disc is often enough for a cat in a cool room.
4. For garages, porches, barns and shelters, pick a pad sized to the animal and rated for outdoor use.
5. Check the outlet. Outdoor gear should go into a GFCI-protected outlet. If you don’t have one, have one installed before winter rather than running a long cord out a window.
6. If water freezes, add a heated bowl and put it in the same sheltered spot as the bed.

What not to do

• Don’t use a human heating pad or electric blanket in a pet bed. They aren’t built for animals that can’t switch them off, and cords and wiring don’t stand up to claws and teeth.
• Don’t clamp a heat lamp over a dog bed, doghouse or coop. Heat lamps get hot enough to ignite straw and bedding, and they’re a common cause of barn and coop fires every winter.
• Don’t leave a space heater running in a garage or shed for a pet overnight.
• Don’t put hay, blankets or towels in an outdoor shelter. Alley Cat Allies points out that they soak up moisture and leave the shelter wet and cold. Use straw.
• Don’t use an indoor bed outdoors. K&H’s Pet Bed Warmer, for example, isn’t designed for outdoor temperatures.
• Don’t add antifreeze, glycerin or salt to a pet bowl or bird bath to keep it from freezing.
• Don’t ignore a chewed cord. Unplug it and replace the product.

Which one should you buy?

For an indoor cat or a small dog that just likes to be warm, a K&H Thermo-Kitty Bed or Thermo-Kitty Mat is the easy choice. They draw 4 to 6 watts and cost well under a dollar a month.

If your dog already has a bed he loves, slip a Pet Bed Warmer inside it instead of replacing the bed.

For a dog or cat that sleeps in the garage, a mudroom, a barn or an insulated doghouse, get a Lectro-Soft pad sized to the animal. The 24 x 19-inch, 40-watt pad fits most medium dogs or a couple of cats. The 36 x 25-inch, 60-watt pad suits big dogs.

For strays and community cats, a heated shelter with two exits is the better buy than a bare pad, because it gives them wind protection and a warm floor in one.

If water freezes, a 25-watt Thermal-Bowl covers most cats and small to medium dogs. Bigger dogs or several animals drinking from one bowl need the 5.5-quart Farm Innovators bowl.

And if you would rather not plug anything in, a self-warming pad or a SnuggleSafe disc costs nothing to run.

Our picks

These are good starting points. Check the size, the indoor or outdoor rating and the wattage on the listing before you buy, and keep all cords where pets can’t chew them.

Four example homes

These are worked examples with round numbers, not measurements, all at $0.17/kWh.

The 16-year-old indoor cat. A 4-watt Thermo-Kitty Bed stays plugged in by the radiator all year. That’s 8,760 hours and about 35 kWh, roughly $6 a year, and less in practice because the heater only warms fully when she’s in it.

The farm dog in an insulated doghouse. A 40-watt Lectro-Soft pad and a 25-watt Thermal-Bowl run from November through March, about 150 days. The pad, counted as if it never shut off, uses 144 kWh, about $24.50. The bowl, at half the time, uses 45 kWh, about $7.65. Together that’s around $32 for the winter, or $47 at $0.25/kWh.

The garage dog and the space heater. A 1,500-watt heater runs on high for 10 hours a night, 120 nights a winter, so the dog sleeping in the garage stays warm. That’s 1,800 kWh, about $306. A 60-watt large Lectro-Soft pad in a raised, draft-free bed, left on around the clock for the same 120 days, uses about 173 kWh, roughly $29. The switch saves about $275, and it removes a space heater from a room full of gas cans and paint.

The porch colony. Three community cats share a 20-watt heated kitty house and a 30-watt Thermo-Kitty Café from November through March. The house, run nonstop, uses 72 kWh, about $12. The café, at half the time, uses 54 kWh, about $9. That’s about $21 for the season to keep their water open and their floor warm.

Setting it up so it works

• Put pads and bowls in a sheltered spot. Wind is what makes outdoor bowls run constantly and pulls heat out of pads.
• Get the bed off the floor. Concrete and tile pull heat out of a bed all night. A raised cot, a pallet or a thick foam base under the pad helps.
• Use a cover between the pet and the heater. Most K&H beds come with one. For insert warmers, follow the padding guidance in the instructions.
• Test before you decide it’s broken. Put your hand flat on the bed under a folded towel for 10 or 15 minutes. Pet-activated beds don’t feel warm when they’re empty.
• Route cords along walls and behind furniture, and use a cord protector for pets that chew. Look at the cord every few weeks.
• Put outdoor gear on a GFCI outlet. Cornell Lab of Ornithology gives the same advice for bird bath heaters.
• Clean bowls and bird baths every few days. Warm standing water grows algae quickly.
• Unplug outdoor gear in spring and store it dry.

Troubleshooting

Is it worth the money?

For most pets, yes, and it is one of the few winter purchases where the running cost barely matters. An indoor cat bed costs about $6 a year to run. Even a large outdoor pad running nonstop costs about what a basic streaming subscription does, and only for the cold months.

The real savings come from what a heated bed lets you stop doing. If it replaces a space heater in the garage or lets you turn the house down at night, it can save more than it costs within a few weeks. Our garage heater guide and space heater guide have the numbers for heating a whole room.

Bottom line

Pick a pet-rated, thermostatic bed sized to the animal, put it in a dry, draft-free spot off the floor, and plug outdoor gear into a GFCI outlet. Add a heated bowl if water freezes where your pet drinks. Skip heat lamps, human heating pads and overnight space heaters. And if your pet is healthy and indoors, try a self-warming pad first, since the cheapest heat is the kind that doesn’t need an outlet at all. For the rest of the house, start with the priority checklist.

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