EcoRenovator - View Single Post - Solar water preheater project based on builditsolar $1000 system

strider3700 · 02-17-11, 05:13 PM

I can see the issue about it being blown off of the roof. Highly unlikely if you're not building crap and not applicable in my ground mounted application.

I see no way of forming a steam rupture in my drainback vented non pressurized system.

I've seen the draft version of F379 so I can see that they're ultra paranoid about cross contamination. My last drawing used a TUV/UL approved vented double wall stainless steel heat exchanger. It should make anything to do with the collectors not applicable.

I can accept them deciding that a single wall pex heat exchanger isn't good enough but the rules they are forcing has driven the cost of an approved system to levels making the systems not attractive at all.

02-17-11, 05:13 PM	#37
strider3700 Master EcoRenovator Join Date: Dec 2008 Location: Vancouver Island BC Posts: 745 Thanks: 23 Thanked 37 Times in 30 Posts	I can see the issue about it being blown off of the roof. Highly unlikely if you're not building crap and not applicable in my ground mounted application. I see no way of forming a steam rupture in my drainback vented non pressurized system. I've seen the draft version of F379 so I can see that they're ultra paranoid about cross contamination. My last drawing used a TUV/UL approved vented double wall stainless steel heat exchanger. It should make anything to do with the collectors not applicable. I can accept them deciding that a single wall pex heat exchanger isn't good enough but the rules they are forcing has driven the cost of an approved system to levels making the systems not attractive at all.