Replacing Electric Water Heater with Heat-Pump Water Heater
I’m looking to replace an existing electric water heater (50 Gallon, installed in 2009) with a more efficient heat pump water heater. I have some questions and concerns, and this seems like the best place to get reliable answers, so thanks in advance! Sorry for the mix of questions–I hope this is ok. If not, I can create separate posts.
– Currently have a 50 gallon tank, and we sometimes run out of hot water (couple times a month). A larger tank would fix this obviously, but to me seems like this would be less energy efficient. However, in the “Rewiring America” guide “Electrify Everything in Your Home” they claim ‘bigger is better’ and that the most efficient thing is a bigger tank. I get that a bigger tank ‘stores’ more hot water like a battery, but.. there’s also more volume to keep warm. I suppose the tradeoff is how much is lost to surface area, which would be less per volume for a larger tank? So, is a larger tank both actually more energy efficient?
– similar to above, the Rewiring America guide also suggests keeping the tank very hot and using a mixing valve to control output temp. This makes little sense to me, as the temperature differential between temp inside and outside the tank should be the largest factor in total energy use, right? Or am I missing something?
– the Rheem units look to be the most energy efficient, at least according to the Energy Star website. However, I’ve read the noise complaints here and on Reddit. Seems like that MIGHT be fixed, but I’m hesitant to take the chance. Any recent updates on that one?
– Also, the Rheem units have app-compatibility. However, I recall reading somewhere (can’t find where right now) that some features are ONLY available in the app. If this is true, I’m hesitant to buy one, as I don’t want a water heater that is crippled in 5 years because there’s no longer app support for it. Are there functions only available in the EcoNet app, or can everything be controlled on-unit?
Thanks for any feedback!
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