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Gravity feed system conversion
I have an old closed system gravity feed hot water system. I have a newer boiler Im hooking up and want to make sure I dont forget anything. The original boiler is a converted coal to gas boiler. There are 2 2" supply lines and one return. There is nothing in the attic that would make this an open system. It appears to be closed. There is a large expansion tank 3' by 1' in the basement and a water line with a regulator coming from the water main as a make up to top off the system.
Im going to put in one circulator pump a BG 100, and a bypass with two valves. The new boiler will be about 6' from the old one and Im going to tie into the 2" pipes with 3/4 " pipes from the new boiler.
I attached a picture of what Im planning on doing. Will this work or am I missinf something? Is there anything special I should do when I tie the 3/4 into the two 2" lines? I was goint to extend the 2" line a bit so I can attach the two supplies then attach the 3/4 to it
I read the gravity feed info on this site and I think Im about set but any extra info would be great