Best Of
Re: Correct Boiler
When it comes to sizing your boiler you want a room by room heatloss analysis to be performed to ensure that the right size boiler is chosen for your home.
From my experience performing many Heatloss analysis’s a house from the 50s and at 1700 square feet your most likely looking at a total heatloss of 40,000 btus. But definitely can me even less then that. Where in NJ are you located?

Re: Wall heater not igniting
The pilot looks a lot better. Looks like it is hitting the thermopile I think but the picture is blurry.
Re: Used Diesel While We Wait for Delivery = Black Smoke
if it is backfed through a breaker, all of the current flowing on the bus has to enter through that position so any position on the bus has to be capable of carrying the full current of the bus.
the larger breakers taking 2 positions per pole solves the problem of the stab being rated for less than the bus. if you are using a breaker listed for use i that panel it will take 2 positions per pole if one stab can't handle the current.
we have drifted way off topic here.

Re: One radiator doesn’t heat. Is it imbalanced venting?
Improper near-boiler piping can cause this- post a pic of yours.
Re: Wall heater not igniting
Yeah. Take the pilot assembly out and clean it. The flame is yell, should be blue and it needs to hit the thermopile. Probably dirty sometimes you get a spider in there. Disconnect gas at gas falve take the screws out and gently pull the whole thing out.
Re: Help installing nest thermostat gen 4 to boiler system
Connect about a three foot long piece of thermostat cable to the Nest while it’s off of the wall. Take it outside, sling it around above your head several times as hard as you can, then release it and let it fly as far as you can. Don’t go after it, just leave that piece of junk where it lands.
You’ll have done yourself the biggest favor possible.

Re: Help installing nest thermostat gen 4 to boiler system
And more to the point — it won't control your system any better than the old Honeywell. It's fun, perhaps, to mess with these things — but it's no improvement.
Re: Need advice sizing a hydronic radiant floor on-demand heater
Just use the minisplit. Don’t throw good money after bad!