Heat pump water heater?

Technology
1

Does anyone have experience with one of these? They essentially incorporate an air conditioner and are supposed to be way more efficient than your standard electric water heater. Power company offers big rebate if you bite, but I am wondering about reliability. My 30 YO standard unit is pretty faithful…

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I don’t have one but opted for the old reliable when I replaced mine last year. You are replacing a dumb and very reliable tank with over engineered tank that will save you a few bucks per month. They require maintenance like replacing or cleaning the air filter and periodic cleaning of coil. If you can’t do these things yourself, you will spend more on annual service call then you will ever save on your energy bill. When/if they need to be repaired, I suspect the repair cost will exceed the replacement parts and you will end up with a disposable appliance like the modern refrigerators, dishwashers, clothes washer and dryer.

3

I asked chatgpt…

:fire: Heat Pump Water Heater (HPWH)

:white_check_mark: Pros:

  1. Energy Efficient:
  • Uses 60%–75% less electricity than a traditional electric heater.
  • Saves significantly on utility bills over time.
  1. Lower Operating Costs:
  • Although more expensive upfront, they pay for themselves in energy savings, typically within 2–5 years.
  1. Eco-Friendly:
  • Reduces carbon footprint due to lower electricity usage.
  1. Dehumidifies Air:
  • Acts like a dehumidifier, which can be a bonus in damp areas like basements or utility rooms.
  1. Longer Lifespan:
  • Can last 10–15+ years with proper maintenance.

:cross_mark: Cons:

  1. Higher Upfront Cost:
  • Typically $1,200–$2,500 for the unit alone, vs. $300–$600 for a traditional electric.
  1. Needs More Space:
  • Usually 6–8 feet of vertical clearance and good air circulation.
  1. Slower Recovery Rate:
  • Heats water more slowly, which can be an issue with high hot water demand unless supplemented with electric resistance backup.
  1. Noise:
  • Contains a fan and compressor, which produce low-level noise (like a fridge or dehumidifier).
  1. Temperature Sensitivity:
  • Less efficient in cold spaces (below ~40°F), although hybrid models can switch to resistance heating when needed.

:high_voltage: Traditional Electric Water Heater

:white_check_mark: Pros:

  1. Lower Initial Cost:
  • Cheaper to purchase and install.
  1. Simple Design:
  • Fewer components, easier to repair, widely understood by plumbers.
  1. Faster Recovery Time:
  • Heats water more quickly, useful for high-demand households.
  1. Works Anywhere:
  • Not dependent on ambient air temperature.
  1. Compact Footprint:
  • Fits in smaller spaces, no need for air circulation clearance.

:cross_mark: Cons:

  1. High Operating Cost:
  • Can be 2–3 times more expensive to operate compared to HPWHs.
  1. Energy Inefficient:
  • All heat is created through electrical resistance, which is inherently less efficient.
  1. Shorter Lifespan:
  • Typically 8–12 years, sometimes less depending on water quality and usage.
  1. No Environmental Benefit:
  • Higher energy consumption leads to higher carbon emissions unless powered by renewable energy.

:light_bulb: Summary

Feature Heat Pump Water Heater Traditional Electric Water Heater
Upfront Cost High Low
Energy Efficiency Excellent Poor
Operating Cost Low High
Installation Space Requires space and airflow Compact
Recovery Rate Slower Faster
Noise Audible (low hum) Silent
Cold Climate Use Less effective No impact

Let me know your climate, household size, and location (e.g., basement or closet install), and I can help recommend the better fit.

4

I can’t speak for a heat pump waterheater, but I can relate a setup I had in Florida. Don’t know what it was called. The house I bought in 90s had a conventional electric one, but it was somehow tied into AC/Heat unit. I never turned on the electric power to the heater in the summer months, and it even provided some heating capability during the winter cycle. In the summer, the water was often almost dangerously hot out of the tap as I recall. A heatpump water heater sounds like sound idea to me.

5

Thanks guys. Sarge example sounds exactly like what they are peddling, only with AC unit dumping house heat into the water heater. Much bigger source of heat than the stand alone unit. I like the idea; it’s like the hybrid car feeding kinetic energy to battery when you brake.

The AI stuff is interesting. Looks like it needs to be well filtered by the consumer. Saying the far more complicated unit is expected to last longer is I think bull. Since that is not believable, I will presume that the purported energy savings is also suspect.

Similar phenomenon happens with sewing machines. We have some that are 40 to 100 years old and not only work great but are repairable. Newer ones have electronics and are not practical to repair.

I’m going with @imabass logic. Not trading simple unit for trouble, presuming Dims don’t get back in and outlaw simple.

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