chimney liner size for gas boiler

Hi there – any ideas what diameter liner I’ll need for a gas boiler in a 2 family, 4 story home? We just had a new liner put in for oil boiler + 2 gas hot water heaters – 10″ stainless steel (approved by DOB for dual-fuel). I’m hoping it’ll be sufficient for a gas boiler, too? Any thoughts?   Thanks!

empathie00

in Boiler Repair 12 years and 10 months ago

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slvillager | 12 years and 10 months ago

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call a chimney person to come look. we had a surprise with our oil to gas conversion where our basement filled with smoke and we had to do emergency relining. not fun at all.

empathie00 | 12 years and 10 months ago

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Phew – great, thank you both very much! I don’t want to go through the chimney relining process (and cost!) again, so this is good news. 🙂

eman134 | 12 years and 10 months ago

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as long as the gas fired atmospheric vented boiler is approximately the same amount of btus (probably less) than the oil fired unit that you are replacing…no problem

Master Plvmber | 12 years and 10 months ago

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If it’s good for oil, it’s good for gas as long as both boilers are under 85% efficient.