I have a summer/winter oil boiler in a small furnace room in the center of a circa 1960's split level. The chimney was relined last year. This year I was going to remove the above ground oil tank from the crawlspace and have a new one put in, but with oil prices being what they are, decided to see if I could get gas and what cost would be involved. New oil tank was either going to have to be outside, which I didn't like due to safety/gelling issues (SE PA), or I was going to have to lose a closet in the laundry room.
Turns out I can have a gas line run fairly cheaply.
I only plan on being in the house for 5-7 more years so while I planned on getting professional opinions for both standard/HE, I was most likely going to go standard. Venting the PVC is going to be problematic and ugly given the location and I don't see HE being worth the cost.
First guy comes out and says he can do a summer/winter boiler, gas fired, run the gas line, hook up the new boiler, I need a new expansion tank, and we're done. He went around and measured the baseboard heaters and said the boiler is about 2-2.5 times the size it should be.
Second guy comes out and says they don't make summer/winter boilers anymore because they are too inefficient. He agreed the boiler was twice the size it needed to be. He said there was no reason to measure the baseboards, it doesn't matter. His recommendation was a standard boiler and a gas fired tank water heater. The complication there is that due to the space constraints in the room, in order to fit the water heater I'm looking at tearing down a wall or partially blocking access to the crawlspace. He didn't look at anything else in the house and left.
I've had tank water heaters in the past and actually I prefer the summer/winter hookup.