I'm separating the gas on a small 2 family building. I will use the existing boiler & hot water heater for the first floor apartment. I'm trying to find the most economical cost for heating & providing hot water for the second floor unit which is 588sq ft, has R30 in the attic which is the ceiling of the apartment, no wall insulation, has 3 external walls, 8 single pane windows with storms, and the floor will most likely be heated from the apartment below. The closet I have to install the furnace/boiler/combi/whatever you suggest is a 4' x 2' closet & vents can go out the wall or up the through the roof. Please advise.
You can use a short boy water heater, which may need to be special ordered from home depot/lowes. I have one myself. 38 gals and right around 4ftx2ft if I had to guess off the top of my head. you can consider using electric baseboard heaters as well if that is economical.
I'm with Colleen. Electric baseboard for an uninsulated space will be very expensive to operate and will require space that you may or may not have in your panel and pretty large wire to bring up, although if you use a small resistance hot water heater like Andrew suggests, and which might be your only option, I guess you'll be running wire anyway.. Minisplits rock these days, even in extreme cold, which used to not be true. But you do need to find a place outside for that condenser....
Is it not possible to insulate these walls if you're already doing work on this place? A few inches of polyiso, seams taped, with sheetrock over it would make the space much easier to heat.
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