3 ms·
Isn't the minimum exhaust temperature the same as the temperature of the heated water? How can it be less?
by marktangotango 5y ago
Isn't the minimum exhaust temperature the same as the temperature of the heated water? How can it be less?
- dhajzhz 5y agoIf the exhaust is too cold the water vapor condenses out left with a puddle of acid (the acid is from the trace sulfur in the Nat gas) Also, cold exhaust doesn't exhaust (since it cant rise through a density change). So, if your exhaust is too cold, it will collect in your basement (CO2 should be a bit denser than air, so absent any drafts it'll collect) The previous owners of my house installed my high efficiency stove improperly using the old brick flue. The fumes eventually ate away at the mortar and a few bricks fell I'm clogging it.
- yetihehe 5y ago> Also, cold exhaust doesn't exhaust Unless you have a fan blowing smoke into flue. Without fan, my furnace would not work, exhaust is only slightly above water temperature and furnace is designed so that condensate pools in special container, which you have to empty or connect to sewage.
- kwhitefoot 5y agoMost new and recently installed domestic gas boilers in the UK use balanced flues not chimneys and are condensing boilers. The exhaust is fan assisted and the temperature is very low. See https://en.wikipedia.org/wiki/Condensing_boiler#Exhaust https://en.wikipedia.org/wiki/Condensing_boiler#Exhaust
- namibj 5y agointake air preheating and cold return water preheating come to mind