What does a stock tank heater cost to run?

Short answer

A 1,500-watt heater running all day is about $6.55 a day at the 2026 average rate — roughly $200 a month. Most run half the day or less.

Watts ÷ 1,000 × hours it actually runs × your price per kWh. A 1,500-watt stock-tank heater on around the clock uses 36 kWh a day; at EIA's 2026 US residential average of 18.2¢ that is $6.55 a day, about $197 a month. University of Wyoming Extension put the same heater at about $4 a day, $120 a month, at Wyoming's lower rates. A thermostat means it doesn't run all day: Alberta measured waterer elements running 12–24 hours on the coldest days. A 250-watt heated bucket running 12 hours is 3 kWh, about 55¢ a day.

The arithmetic

kWh per day = watts ÷ 1,000 × hours the element is actually on. 1,500 W × 24 h = 36 kWh. 1,500 W × 12 h = 18 kWh.
Dollars per day = kWh × your rate. 36 × $0.182 = $6.55. Your rate is on your bill; EIA's US residential average was 17.3¢ in 2025 and is projected at 18.2¢ for 2026.
Month = day × 30; winter = day × the days it stays plugged in. 18 kWh a day for 120 days is 2,160 kWh, about $393 at 18.2¢.
Add heat tape on the supply line if you run it. Alberta notes it adds to the waterer's use but gives no single figure — check its wattage the same way.

Why do people report $20 a month and $200 a month for the same heater?

Wattage is printed on the box. The two numbers that aren't are how long it runs and what you pay for power.

University of Wyoming Extension: 1,500 W tank heater ≈ $4 a day, $120 a month, at Wyoming residential rates
Alberta Agriculture: Electric waterers with 600–1,000 W elements ran 12–24 hours and used 7–24 kWh on the coldest days; 1,450 and 1,828 kWh over a season in PAMI tests (150-head units)
U.S. Energy Information Administration: US residential average 17.3¢ per kWh in 2025, 18.2¢ projected for 2026 — states run from well under to well over that
NYSERDA (New York): An uninsulated 1,500 W heated tank is the first thing to replace; energy-free waterers save 40–100% with a 4–15 year payback

A thermostat-controlled heater in a lidded tank in Georgia might run three hours on a cold night; the same heater in an open tank in a Minnesota wind runs all day. Multiply that by a 2× spread in electricity prices between states and a 10× difference in the monthly bill is ordinary.

Read the watts off the heater, read your rate off the bill, and borrow or buy a plug-in energy meter for one cold week. That gives you the hours, and the rest is the calculator below.

What changes your number

Cover the tank. WVU's advice: cover half or more of the trough surface with plywood and insulate it. Less open water, less heat lost, fewer hours on.
Keep the water moving. Moving water is slower to freeze; a floating ball that the animals push around keeps a hole open (WVU). Free, and it shortens run time.
How many drink from it. Low-energy and insulated waterers rely on fresh water cycling in; Alberta says they need at least 10 head of cattle or horses drinking to stay open in the cold. A tank for three goats gets little help from turnover.
Thermostat set point. Alberta's waterer bowls regulate at 4–6°C (about 39–43°F). A heater that holds the water warmer than that is spending money the animals don't need.
Your rate. The same heater costs nearly twice as much in a high-price state as in a low one. EIA's 18.2¢ is a national average, not yours.
Wind. An open tank in the wind loses heat fastest. A wind break or a tank in the lee of the barn runs fewer hours.

A number we won't give you

How many hours your heater runs. It depends on the tank, the lid, the wind, the set point and the night, and no published figure covers a 100-gallon tank behind your barn. We show 6, 12 and 24 hours; a plug-in energy meter tells you yours in a week.

Cost per month at 18.2¢ a kWh

Heater	Runs 6 h a day	Runs 12 h	Runs 24 h
250 W	$8	$16	$33
500 W	$16	$33	$66
1,000 W	$33	$66	$131
1,500 W	$49	$98	$197

30-day month at EIA's 2026 US residential average. Halve the rate, halve the bill. 250 W is a typical heated bucket or small de-icer; 1,500 W a common stock-tank heater — check yours on the label.

What extension measured

Setup	Energy	At 18.2¢	Source
1,500 W tank heater, all day	36 kWh/day (derived)	$6.55/day	University of Wyoming ($4/day at Wyoming rates)
Electric waterer, coldest days	7–24 kWh/day	$1.27–$4.37/day	Alberta Agriculture
Electric waterer, 150-head, whole season	1,450–1,828 kWh	$264–$333/season	Alberta Agriculture (PAMI tests)

The Wyoming article gives dollars, not kWh; 36 kWh is 1,500 W for 24 hours.

Run your own numbers

Put in the watts from the label, the hours it really runs, and your rate from the electric bill.

Your heater and your rate

Heater wattsIt’s on the label or the box.Hours a day it actually runsA thermostat cycles it. Alberta measured 12–24 hours on the coldest days; a mild night is far less.Days it’s plugged inElectricity, ¢ per kWh18.2¢ is EIA’s 2026 US residential average. Your bill has yours.How many heaters

It costs about

$98 / month

Per day: $3.28
Whole winter: $393
Energy per day: 18.0 kWh
Energy, whole winter: 2,160 kWh

A lid over half the tank and a float to keep the surface moving cut the hours it runs — that’s WVU’s advice, and it’s free.

When an energy-free waterer pays

NYSERDA puts typical savings from replacing heated waterers at 40–100% with a 4–15 year simple payback, and singles out uninsulated 1,500 W tanks as the place to start. University of Wyoming Extension tested a commercial solar stock tank ($781 for 42 gallons, rated not to freeze to −50°F) against a $145 do-it-yourself version: the commercial tanks stayed open at every temperature they saw; the homemade one failed below 10°F. At $4–6.55 a day for a 1,500 W heater running around the clock, a $781 tank is about four to six and a half months of that heater's electricity.

Then stop planning from averages

The calculator gives you the electric line for one heater. In Homestead Paradise the heater goes on your equipment list, the power bill goes in the books against the livestock, and the budget page shows whether winter is running over what you planned. 14-day free trial, no card.

Start your 14-day trial — no card

Keep planning

How much hay do goats need for winter?How much hay do sheep need for winter?How much hay does a cow need for winter?How many bales of hay do I need for winter?What does it cost to feed livestock through winter, per head?How much water do livestock drink in winter?

Sources

Every figure on this page comes from a land-grant university extension service, a government agriculture or energy agency, or a breed registry — never from another blog.