I want to replace my methane gas water heater with a heat pump water heater. I also want to avoid refrigerants with a high Global Warming Potential: https://en.wikipedia.org/wiki/Global_warming_potential
This greatly limits my appliance options, although I was able to find a ventless heat pump dryer that meets my specifications, a Blomberg DHP24404W which uses R290 (refrigerant grade propane) with #GWP 3. It works great and that gave me confidence that with enough effort and patience I could succeed.
I found two options: 🧵
First, #GE’s #Geospring:
https://cleantechnica.com/2025/07/10/ges-new-heat-pump-water-heater-takes-the-technology-to-new-heights/
https://www.geappliances.com/appliance/GE-Profile-GEOSPRING-Smart-Hybrid-Heat-Pump-Water-Heater-80-gallon-120V-FlexCapacity-PF80S10FPY
This is a unitary water heater, using HFO-1234yf #refrigerant, which has a GWP of <1: https://en.wikipedia.org/wiki/2%2C3%2C3%2C3-Tetrafluoropropene
I haven't been able to find a local source, but it seems I can order it online and have it shipped for a plumber to install: https://www.wayfair.com/home-improvement/pdp/ge-profile-geospring-smart-hybrid-heat-pump-water-heater-80-gallon-120v-flexcapacity-ghro1041.html
Pros:
* Can run on 120V, can avoid electrician
* Cools basement in summer
Cons:
* Cools basement in winter
* Resistance heat backup
🧵
#WaterHeaters #HeatPumps
GE Profile™ GE Profile GEOSPRING Smart Hybrid Heat Pump Water Heater 80-gallon - 120V - FlexCapacity | Wayfair
2,3,3,3-Tetrafluoropropene
GE Profile™ GEOSPRING™ Smart Hybrid Heat Pump Water Heater 80-gallon - 120V - FlexCapacity|^|PF80S10FPY
GE’s New Heat Pump Water Heater Takes The Technology To New Heights - CleanTechnica