LsFarm wrote:Welcome to the forum.
It looks like a good, well built boiler, I'm surprised there isn't some form of markings on the steel vessel. It looks like a pressure-system boiler, so it should have a stamping on it somewhere..
I'd recommend a circulator pump, a gravity flow system really needs large diameter piping to flow well. and it looks like you have 3/4" piping.. which will need a circulator pump to work well.
Keep us informed..
There is a tag on the top of the boiler but it looks like there might have been a water leak at on time and the tag is pretty much rusted off. I can try and get a picture of another evening here in the near future.
As for needing large diameter pipe to do gravity flow. The whole basement has 3" or bigger pipe the whole way around the outside walls. I have a 2" pipe coming out the top of this boiler and 2, 1 1/2" cold water returns going into the bottom of the boiler. What I want to try is, 2" going into the bottom of the boiler on both cold water returns just drop to 1 1/2" where it goes into the boiler and have to 2" going out the top feeding the house. I want to use couplers and make it easy to add circulators if I need to. Just going to try gravity first for cost savings right now. Thanks guys!