Best Of
Re: Rinnai Cycling on and off
I finally received the replacement servo/bypass valve and it took me about 45 mins to install it. I now finally have a fully functioning water heater. That was it…
Many thanks to everyone for the ideas and suggestions.

Re: New Crown boilers - updated piping
It seems like at least this plumber specified a gordon main valve in his quote and didn't put that in. A cheap main vent will fail early correct? I paid for quite a bit of this on my credit card. If he refuses to change the main vent or doesn't respond, I could get a quote from a better steam guy, and contest the amount of that quote against the original plumbers charge on my credit card. Unless people in this group think this is a bad thing to do. I texted the plumber who put in the bad main vent once already about this and he has so far not responded. I will continue to ask him to make it right but I may have to go the credit card route.
He's probably done with you. If he specced a Gorton and put in that thing then yes, that was bad practice on his part. If you do a chargeback, you'll never have him as a plumber again (which might be a good thing). The Gorton would cost him about $45, the one he put on was probably under $20.
To me that's "walk away money" but maybe not to you, I can't choose for you.
Re: Advice for Designing Radiant System for Small Cabin
Here is the woodstove I have in my camper. I heat and cook on it with scrap 2x4 wood, free at most any joibsites. The inventor developed it for sailboats, as he struggled to find a good quality stove for this own boat.
It burns very clean with a bit of a gasification section in the design.
It's about 12" square, takes up little room.

System 2K boiler oddly fires briefly
When the boiler is hot and circulating to the zone calling for heat, it will abruptly restart and fire the boiler for a second, then go back to normal.
Is my energy manager going bad? Is there a short? Any suggestions?
Video demonstrating the weird reboot:
https://youtu.be/--TOEeEDJ2Q?si=IBSaCzSIk2UfRqsi
Thanks in advance!
Re: Water consumption in extreme cold weather
For perspective I have a 150 year old house with a 44 year old Peerless boiler. I go through about an inch of water on the site glass per month during the coldest month of the year.
I topped it off a week ago before this cold spell and it has barely budged, maybe a quarter inch?
It is working its butt off right now, but keeping the house warm at 68 degrees.
Re: Smoke smell in house with oil boiler
So there's likely nothing you can do short of turning the boiler off. That doesn't sound like a good option. It sounds like a combustion/Ignition issue which is not DIY. Or a venting issue and turning off the kitchen and bathroom exhausts might help with that. Can you get an emergency service?

Re: Water consumption in extreme cold weather
12 seconds!?!
How low on the glass is it after 1 day?
Re: Replacement Boiler Size Question
@dannyg40 If it ain't broke...
That boiler will probably outlast us all.
Re: Boiler cracked?
No, don't believe I'm losing water (unless of course its a real problem and it just happened to start). I have been watching it closely since the main vent failed.

Re: Main vent recommendation?
Those street elbows don't have full-size 1/2" passageways. This can slow the venting rate. I'd change them to regular elbows and short nipples.