Best Of
Re: How Does This Look?
Looks good but where the backflow preventor and a electronic low water cut off unless its equipped w a digital aquastat w a lwco feature ,both are code in my area if getting inspected . Other wise welcome to doing it the correct way now dont fall back into old habits . Its a wonderful thing when ya don't have to remove convector covers to bleed rads and convectors . on another note if looking to get better try califee demineralizing filter to bring your fill water within what the manufacture's specs . Keep up the good work .
peace and good luck clammy

Re: Bit different
Thanks, clammy. A fun project. Yeah, I think most of them are gone now. That thing will survive this whole so-called human race.
Re: Indirect HW off steam- shaking circulator
May need to add the bypass that is shown in most diagrams for hot water loops off a steam boiler or a ball or globe valve on the discharge of the circulator so you can throttle it.

Re: Heat loss calc..
Trust your fuel bill. It is correct. That's a design heat loss of 18 BTU/hr/sq ft, which is easily achievable in your zone with average amount of insulation and reasonably tight envelope.

Re: Bit different
The funny thing i used to see them all the time about 25 to 30 years ago in paterson nj in a scrap yard where i would occasionally get salvaged radiators never thought much about it . Since then i don't think i ve seen even one in any scrap yard guess they all are ancient maya history now . Thanks for sharing your find .
Ps Ed your looks sweet
peace and good luck clammy

Re: Drip to nowhere.
No evidence there were ever under the floor wet returns. This is the only drip in an otherwise conventional one pipe system.
I have to open up more wall to see where it ends. Being in line with the sink drain raises suspicions.
Re: Missing skim pipe
Side note, this is why i need to get rid of the stanley black and decker stock i inherited.

Re: Faucet brands
I've had superb luck with Chicago Faucets — both original quality, and as some of you may have read, with service. Likewise I've never had any trouble with Moen, although I find that it is necessary to replace the cartridge from time to time — perhaps every ten years — but again, they are very responsive.
I have Kohler single handle faucets for all bathroom lavatories, and I've never had to repair them. The tubs and showers are a rather odd mix…
Years ago I did use Delta, but… something happened and I found them to have short lifespans.