Best Of
Re: Boiler replacement estimate
We built this site so that people could connect and share knowledge with one another. It's always been give and take. And many friendships have formed over the years. @mikedo, you've been in our community a long time and have received a lot of free advice from generous and knowledgeable people, so I'm taken aback by your disparaging comment and negative perspective of your time here. No one is forcing you to be here or to help others in return if you do not wish to do so.
I'm sorry to our OP @jerrykane123 that this has gone off topic. Let's get back on track. Thank you.
Re: Understanding tankless recirculating water heaters
If it was mine I would toss it out and install a tank type water heater. Some will recommend a heat pump water heater, but they have their own issues, and I am sure you are sick of water heater issues.
I agree with you that if it worked right for the first 6 months the plumbing is likely ok but a faulty cartridge could cause some strange issues. Maybe @Larry Weingarten and others will have some ideas.
Re: Boiler replacement estimate
There’s no “us” and ”them” here, @mikedo. It’s what we’ve been doing for 27 years. It’s a community, made up of all sorts. Everyone is welcome here. It’s WE.
Re: System design
When I see a third floor radiator that doesn't get much heat, the first thing I look at is whether the water in the boiler has enough pressure to reach the third floor. The second thing I look at is making sure absolutely all of the air is out of that loop. I would check those two things before doing anything else.
Since it's old/new-to-you, we don't know if it once worked and has stopped, or whether it never worked. Eyeballing it, I'd guess the third floor was added on after the rest of it.
Are the valves marked with X's zone valves? Balancing valves?
Re: AFCI Circuit Breakers
there are lots of times where there is a nick in the insulation or stray strand of wire or metal that goes unnoticed that only touches when you move the device when you unplug or plug something in or operate a switch.

Re: Paint for heater water corrugated stainless steel connections
agree with Larry, tubing made from 316 grade stainless will hold up much better in salt/clorine. Used extensively in for coastal areas.
Moot point if you go with PVC or another plastic type tubing.

Re: Looking for new LP gas boiler recommendations to replace my Buderus GB142/30
Also, newer atmosepheric boilers have just about as many controls as mod/cons and my experience is these fail as often, or more, than those on mod/cons: vent dampers, electronic pilot assemblies, control modules, etc. The only advantage that I see is that a CI boiler generally has a longer life expectancy.
I realize that the common wisdom is that CI boilers are more reliable and cost less to repair, but I believe that's out-dated thinking and it's not been my experience.

Re: Looking for new LP gas boiler recommendations to replace my Buderus GB142/30
A condensing boiler (mod/con) is what you have in the gb142 that vents with PVC or PPL plastic pipe. A new mod/con would vent the same and could likely use the existing venting.

Re: Working around gull nests on flat roof ?
Dump Ducks are a federally protected species blanks in a "9" ????????

Re: AFCI Circuit Breakers
Edited to fix the colors of the test buttons
I think QO and Homeline breakers have more or less the same innards just in a different package. I have 2 QO AFCI breakers that I installed about 20 years ago and I don't think I have ever had them nuisance trip. They are on the 2 circuits that run most of the lighting and general purpose receptacles on the main floor of my house so they are the bedroom, living room, and the 2nd bedroom that has my ham shack in it. When I had an issue with an antenna that wasn't balanced that put a lot of RF in the shack that tripped a couple GFCIs, caused the CO detector to save a reding of like 486 ppm, caused the thermostat to reboot and caused the garage door operator to lock up, they didn't trip. They are whatever type has the light blue test button.
I did have an AFCI receptacle trip a few times with a dehumidifier plugged in to it but it isn't clear that there wasn't a problem with that dehumidifier, it ultimately had its refrigerant escape and it has never tripped on the Aprilaire dehumidifier.
In the last 5 years or so I added a circuit for a bidet seat in my bathroom that is on a afci/gfci breaker and that has nuisance tripped but only when there is a power outage, either something about the power going out or coming back on causes it to see something it doesn't like. The last time it tripped there was nothing connected to the circuit, it was just romex to a single receptacle but it was when the power went out and came back on. It has a purple test button.
