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Oil boiler to Lochinvar Noble Natural gas combi boiler
Lochinvar Noble combi boiler natural gas replacing a 41 year old steel oil boiler with domestic coil.
System is one zone with cast iron radiators. My father in-laws house. I told him the radiators should not get as hot as they used to with the oil boiler as it sent 180 degree water to the radiators. With the large cast iron radiators the system should not need more than 160 F supply water temp on closest day / night.
Question for the professionals. As this boiler was running and my installing partner had it on high fire to test it with his Testo kit I was outside and the vent seemed noisy but the boiler is very quiet inside. (One of my customers installed a Burnham K2FT Firetube 155C combi boiler that is noisy inside and has a quiet vent outside. He just installed a Lochinvar Noble 150 combi and that boiler is quiet inside and has a noisy vent outside. Why are these boilers like that?) Now this vent is sidewall two pipe with flush termination fitting about 18” off the ground. I have a Triangle Tube PE110 in my house natural gas with a concentric PVC vent termination that is 8’ Off the ground because of a public sidewalk. My vent seems quiet or is that because it is so high in the air. My PE110 is very quiet inside.