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Daox · 03-31-12, 08:33 AM

While I agree the gap probably is closing on HP+PV vs SHW, I fail to see how HP+PV can provide 100% of your DHW as this article seems to insinuate. It says the SHW systems only provide ~62% of the DHW needs which is probably quite true of a standard system. But, how can a HP+PV system provide hot water during a week that is cloudy?!? It can not, and I'm not sure why this point has been entirely glossed over in the article. Perhaps because the HP can still be run on mains power and you don't need another form of backup heat? But, this would still reduce the fraction of solar provided heat...

03-31-12, 08:33 AM	#4
Daox Administrator Join Date: Aug 2008 Location: Germantown, WI Posts: 5,525 Thanks: 1,162 Thanked 374 Times in 305 Posts	While I agree the gap probably is closing on HP+PV vs SHW, I fail to see how HP+PV can provide 100% of your DHW as this article seems to insinuate. It says the SHW systems only provide ~62% of the DHW needs which is probably quite true of a standard system. But, how can a HP+PV system provide hot water during a week that is cloudy?!? It can not, and I'm not sure why this point has been entirely glossed over in the article. Perhaps because the HP can still be run on mains power and you don't need another form of backup heat? But, this would still reduce the fraction of solar provided heat... __________________ Current project - To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. & To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.