The house I live in has an existing oil-based boiler for both heat and hot water. The hot water tank (50 gallons) will likely need to be replaced in the next few years as it is more than 10 years old, probably approaching 15. I am on well water without a water softener, and I assume that the previous owners never did any sort of maintenance with the current hot water tank. (A neighbor mentioned that there is some sacrificial part that can be replaced every so often to extend the life of the tank.)
I keep reading that the hybrid heat pump water heaters are incredibly efficient, and I hate having to burn oil during the warmer months just to heat my showers. My plumber tells me that it’s a really efficient system and that I should keep it intact as long as I can. He also seems a bit old school in his opinion and preferences, as he scoffs at the idea that I would eventually like to replace the whole boiler and system with a heat pump system instead.
Is there a good place to learn about how my existing system works, and any way to compare to possible savings (or pitfalls) of switching to a new system? Are there other options, such as tankless hot water heaters, that I should consider? I gather that recovery time with a hybrid heat pump water heater will be much slower than the existing system, so should I also calculate for a larger system (65 or 80 gallons)? Two adults live here full time but we frequently host guests and family gatherings, and we sometimes need enough hot water for 10 or so adults to shower. There are three full bathrooms in the house and one day we may add a fourth.
I replaced my gas water heater with a heat pump water heater. It’s great! I live in a humid climate and having the extra cooling/dehumidifying in the summer is a great bonus. It does make the basement noticably colder all year round though. The energy/financial savings are essentially, I get free hot water in the summer, and a little extra demand for heating the house in the winter.
Recovery time is not really noticeable unless we have company staying with us. My Rheem unit has a “High Demand” mode that kicks on both the heat pump and resistive elements to provide recovery comparable to a gas heater.
The old heater was end of life and the local incentives made it cheaper to install a heat pump water heater than any other type. 15-20 years is considered end of life, most warranties only go to 10 years.
Most tank water heaters have a sacrificial rod or two regardless of heat source
Tankless water heaters are really only practical with burning either oil or gas, the main benefit being you’ll never run out of hot water.
Undecided with Matt Ferrell has a good video on heat pump water heaters Technology Connections has a good video on home electrification
Edit: find a contractor(s) who know how to work with local incentives. Federal tax credits were ended by the “Big Beautiful Bill” last year.
This is the thing that people often ignore about heat pumps. Resistive heating elements, while only 100% efficient, are super simple. If you end up having to run the resistive elements a few times a year, it’s no big deal, it’s not going to break the bank compared to having a much larger system.