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NiHaoMike · 02-21-22, 08:43 PM

R22 has been out of production for many years and is really expensive now. There are a number of different (near) "drop in" replacements such as R433b although I'm not sure what's most popular now. In most applications that used R22, the replacement for new equipment is either R410a or R32 which excels at low temperature but doesn't work well at high temperature.

What's the application of the 160-180F hot water? It's difficult to build a heat pump that goes that high, although it's easier if you only need a little at that temperature (which can be obtained with a desuperheater heat exchanger) and a much larger amount of heat at a somewhat lower temperature of 90-130F.

02-21-22, 08:43 PM	#3
NiHaoMike Supreme EcoRenovator Join Date: Oct 2008 Location: Austin, TX Posts: 1,154 Thanks: 14 Thanked 257 Times in 241 Posts	R22 has been out of production for many years and is really expensive now. There are a number of different (near) "drop in" replacements such as R433b although I'm not sure what's most popular now. In most applications that used R22, the replacement for new equipment is either R410a or R32 which excels at low temperature but doesn't work well at high temperature. What's the application of the 160-180F hot water? It's difficult to build a heat pump that goes that high, although it's easier if you only need a little at that temperature (which can be obtained with a desuperheater heat exchanger) and a much larger amount of heat at a somewhat lower temperature of 90-130F. __________________ To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...