#3. Not as Efficient in Cold Weather
Since heat pumps must exist in a space that remains between
40°F - 90°F, they don’t make the best option for people who live in cold climates.
When heat pumps work in cold weather, it can take an extremely long time to heat up the water in the tank. The system also won’t operate as efficiently, as it relies on the
elements in the tank for supplementary water heating. Thus, when the elements kick in, the household is less likely see the savings they expect to receive from the famously efficient water heater.
To increase heat pump efficiency, many homeowners place the heat pump in a furnace room or other room in the house that has a reliable temperature.
#4. Not Every Service Provider May Service Heat Pump Water Heaters Nor Stock Parts
Although heat pump technology has been making its way into the water heater industry for the last decade, not every water heater repair service nor plumber in your area may have experience with heat pumps because these units are only just beginning to see a rise in popularity. Additionally, many service providers and plumbers may not stock parts for these units due to the ongoing supply chain and sourcing issues. In November 2022 the U.S. Department of Energy even announced an investment plan to fund the "[... acceleration of] domestic electric heat pump manufacturing," including water heaters.
Pro tip: ASK your service provider if the local technician has experience with heat pump water heaters and whether they have parts in stock or would have to order them.