3 ms·
Where are you finding COP for water heaters? The best I found was a field study by the Canadian government where it seemed like most units operating in ambient
by zbrozek 3y ago
Where are you finding COP for water heaters? The best I found was a field study by the Canadian government where it seemed like most units operating in ambient temperatures relevant for me (in central California) get about 2.5.
- danans 3y agoThe COP is roughly equivalent (but more forgiving) than the UEF rating. Many new heat pump water heaters have a UEF of 4 [1], but this accounts for things like standby losses, so the COP of the heat pump itself is higher than that. Some premium hot water heaters like the SanCO2 can achieve COP of up to 5.0 [2], so high that they don't need backup resistance elements, even in northern climates. 1. https://www.energystar.gov/productfinder/product/certified-water-heaters/results https://www.energystar.gov/productfinder/product/certified-w... 2. https://www.smallplanetsupply.com/small-planet-blog/2021/1/7/the-fundamentals-of-game-changing-hot-water https://www.smallplanetsupply.com/small-planet-blog/2021/1/7...
- zbrozek 3y agoHere's the definition of UEF: https://www.govinfo.gov/content/pkg/CFR-2016-title10-vol3/pdf/CFR-2016-title10-vol3-part430-subpartB-appE.pdf https://www.govinfo.gov/content/pkg/CFR-2016-title10-vol3/pd... It would be really nice if manufacturers published delta-T vs COP curves.