Hi, I'm new here. I have a 60 year old oil boiler cast iron radiators & a 20 yr old, 80g eletric water heater . I want to switch to gas mod/con & indirect water heating.
I did a heat loss calc using the slant fin site, (guessed at a few things, temp 0*F, no wall insulation). I came up with ~69k btu/hr.
I've talked to a few contractors, 4 suggested Buderus wall hung, one Weil Mclain. Of those 2 would go with the 106k Buderus, 1 the Buderus 84k, 1 the W/M 80k, still waiting on 1, not hopeful. All based sizing on size of radiators, 1 I asked about heat loss hasn't bid, hmmm. W/M is 20% higher, others close in price.
2 more questions: Most suggested a Super Stor 45g or similar, 1 the W/M 40 plus tank-in-tank style (not the W/M boiler guy ). I'm sure either is more than enough except for visitors. Any opinions on these 2 styles or brands?
Then there's the pvc venting, according to 1 guy Buderus requires 1ft above ground, no higher. Another says it's ok to add a "snorkle" to raise it up another ft. I live in central Mass & we get snow often over a foot so it might be nice not to have to remember to shovel out the vent. Is that OK, unwise, warranty voiding?
Thanks in advance