I’m not an inspector, but I want to make sure this is done right, so I’m asking here. I hope you all don’t mind.
I have a brand new oil fired Bock hot water heater (50 gal) with a Carlin burner. It sits about 3 feet from the opening to the chimney flue in the basement. There used to be a 50 year old oil-fired boiler serving a steam heat system there, vented to the same opening (8"). This water heater will be serving my new radiant floor system (I have done all the plumbing myself). There is also a gas water heater for DHW sitting right next to it, vented separately (and higher) into the chimney via a 4" pipe–single wall galvanized (though I was at Home Depot and saw the type B vent pipes–much more substantial). I did not originally install the gas water heater–a plumber did.
I have two main concerns:
- What, exactly, should the vent be going from the water heater to the chimney opening? i.e, should it be a special type of double-wall insulated vent pipe? Or just the regular old single wall galvanized pipe you get at Home Depot? I actually really just want to hire someone who knows what they are doing to come and vent it and adjust it. The problem is that since I did the installation myself, none of the oil people are interested in coming out to do that. Their service all goes along with becoming an oil customer. Should I try someone other than an oil burner service person?
I ask because I spoke with two oil service people–one who is associated with my oil supplier, but who came out and was completely clueless about the unit (he actually thought the water heater was broken and needed to be replaced and had no idea how to vent it). The other person seemed more on the ball, but did not come out because he did not sell me the equipment or the oil, and he did not have any interest in being paid for a service call. This guy did say that the pipe to the chimney was just single-wall galvanized with a tee and a damper.
My understanding, however, (from the manual) is the following:
“Using “L” or “A” type venting, connect the heater to the chimney. Do not reduce the smoke pipe diameter;use the same size smoke pipe as the heater flue pipe. Run a separate connector from the heater to the chimney where possible. If the heater must be joined to another oil appliance breaching before going into the chimney, enlarge the existing breaching to accommodate the extra volume of gases from the heater. The entrance into the breaching should be at a 45 degree angle.”
It says to install a damper only if necessary. Also what is L or A type venting? Can someone clarify this? Where can I get all the parts I need to do this right?
- My second concern is with regard to the gas water heater sitting right next to it. The gas supply pipe comes down from the ceiling to the left side of the water heater. The vent pipe from the oil-fired water heater will run fairly close to that gas supply pipe (maybe 4"). Is that too close?
I hope I’m just being paranoid, but I don’t want to blow the house up.