Heat scavenging from condensing boiler exhaust.

orange · 02-17-13, 05:33 PM

Hi

Just had a 96% efficient IBC modulating condensing boiler SL-20-155 installed and was thinking if I could scavenge even more heat by using the exhaust gas to preheat the intake air. I would need a compact air to heat exchanger in tubular form. Minimum duct size is 2" I can fabricate with stainless so custom is an option.

I wonder how much more I can squeeze out of it this way. Is it worth the trouble? Any thoughts?

02-17-13, 05:33 PM	#1
orange frugal builder Join Date: Feb 2009 Location: Bowen Island, BC Posts: 16 Thanks: 0 Thanked 0 Times in 0 Posts	Heat scavenging from condensing boiler exhaust. Hi Just had a 96% efficient IBC modulating condensing boiler SL-20-155 installed and was thinking if I could scavenge even more heat by using the exhaust gas to preheat the intake air. I would need a compact air to heat exchanger in tubular form. Minimum duct size is 2" I can fabricate with stainless so custom is an option. I wonder how much more I can squeeze out of it this way. Is it worth the trouble? Any thoughts?