How long does a heat pump water heater last?
A heat pump water heater is really two machines in one cabinet. Underneath is a regular glass-lined electric tank. On top sits a small heat pump. Plan on about 13 to 15 years from the pair. ENERGY STAR's savings calculations assume a 13-year lifespan for certified models, while the 2024 federal water heater rule treats heat pump models as a higher-efficiency electric tank and applies the same average life of about 15.1 years. Neither figure comes from a long field study of heat pump units specifically, because the product has only been common in homes for a little over a decade. Expect two sets of wear. The tank ages like any other tank, and the compressor, fan and evaporator coil age like a small air conditioner. Most units also carry backup electric elements that take over if the heat pump side fails.
What wears out
The storage tank and anode
Below the heat pump module is a standard steel tank with a sacrificial anode rod. A.O. Smith's maintenance guidance for tank heaters, checking the anode yearly and flushing sediment, applies here too. If the tank rusts through, the whole unit is finished even if the heat pump still runs.
Compressor and refrigerant circuit
The compressor pumps refrigerant through a sealed loop to pull heat from the surrounding air into the water. A refrigerant leak or compressor failure is the costliest repair on these units. Refrigerant work requires a certified technician.
Fan, evaporator coil and air filter
A fan pulls room air across the evaporator coil. Dust that builds up on the intake or coil reduces how much heat the unit can collect, so it leans on the backup elements and costs more to run. Many models have a washable air filter for that reason.
Condensate drain
Pulling heat from air also pulls out moisture, which drains away through a condensate line. A clogged line can leave a puddle that looks exactly like a tank leak. Check the drain before you write off the tank.
Backup elements and controls
The resistance elements, thermostats and control board can fail like those on any electric heater. Repairs to the electrical side are a job for a licensed plumber or electrician.
Signs it's near the end
- The unit runs in electric or backup mode all the time and your electric bill jumps.
- Error codes on the display that return after clearing.
- Louder compressor or fan noise than when it was new.
- Water under the unit, after you've ruled out the condensate line.
- Rust on the tank jacket or fittings, or rusty hot water.
- An age past the 13 years ENERGY STAR assumes.
What helps it last
- Clean the air filter as often as the manual says. A.O. Smith's maintenance list includes cleaning air intake vents.
- Keep the space around the unit open so it can move enough air, following the clearance in the installation manual.
- Pour a little water down the condensate drain or check that it flows freely every few months.
- Flush or partially drain the tank yearly, as with any tank heater, and have the anode checked.
- Keep the water temperature setting around 120 degrees Fahrenheit.
- Register the unit with the manufacturer so warranty coverage on the sealed system is on file.
Repair or replace?
The heat pump side and the tank side are separate decisions. A failed fan, sensor or element is usually worth fixing at almost any age, as long as the tank is sound. A compressor or refrigerant leak out of warranty on a unit near 10 years old is where replacement starts to look better. Compare cost per remaining year: take the repair price, divide it by the years the tank can likely give you, and set that beside the replacement cost above divided by a new unit's 13 to 15 years. If the old unit costs more per year to keep, replace it. The 50 percent rule (replace when the repair passes about half the cost of a new unit) is a reasonable shortcut, but count energy too. Running on backup elements costs much more each month than running in heat pump mode, so a stalled heat pump repair has a running cost of its own.
Common symptoms
- Why does my hot water run out so fast
- Why is my hot water rusty
- Why is my water heater leaking from the bottom
- Why is my water heater not making hot water
- Why won't my water heater pilot stay lit
- Why is my water heater making a popping noise
- Why is my water heater relief valve leaking
- Why does my hot water smell like rotten eggs
Common questions
What lifespan does ENERGY STAR use for heat pump water heaters?
ENERGY STAR's savings table for certified heat pump water heaters assumes a 13-year lifespan.
Do heat pump water heaters last as long as regular electric tanks?
DOE's 2024 analysis applies the same average, about 15.1 years, to heat pump and standard electric storage models. The efficiency label's savings math uses a more conservative 13 years.
Will a heat pump water heater still make hot water if the compressor fails?
Most models have backup electric elements and can run in electric-only mode. Hot water continues, but operating costs rise sharply.
Why is there water around my heat pump water heater?
It may be condensate from a blocked or disconnected drain line, which is normal water pulled from the air. Check the line first. Water from the tank body itself means the tank has failed.
Is a refrigerant leak worth fixing on a heat pump water heater?
Under warranty, often yes. Out of warranty on an older unit, the repair cost is usually a large share of a new heater's price, so replacement tends to win.