Best Of
Re: Cold only leak?
probably the tankless heater gasket. It is common for them to leak when cold as the gasket gets old it loses it elasticity.
Re: System 2000, nearly double the cost of Weil McLain, is it worth it?
Thank you, @Hot_water_fan . Idle loss is a characteristic of boilers and has particular relevance with oversizing impacts, load profiles, and annual efficiency. Steady state thermal efficiency and idle loss together provide very good insight into how boilers will perform in the field, so I would say that the study is very relevant and important for making and informed decision.
Roger

Re: System 2000, nearly double the cost of Weil McLain, is it worth it?
I find that hard to believe. Can you give some examples? Tech Support saved my butt a few days ago. And I only waited 2 minutes. I didn't go into a que hole for 3 hours and need to have model and serial numbers of everything before I was connected. I'm also pretty sure my Territory Manager covers your area, and there couldn't be a nicer guy. So justification is needed.

Re: Replumbing: Solder or Threads for Ball Valves
I thought we were talking about the entire system.
I mean, the thread is about replacing valves………

Re: Experience I had with a boiler tech and what I learned along the way.
Some of this depends on how the companies are structured as well. There's a few companies in the Detroit area that have a high turnover rate of employees. I have gone behind some other companies and explain my findings to the homeowner where they say what they didn't catch that. I find some of the companies where they give commission to techs more times that not are the ones to stay away from. The tech is more focused on getting to the next call and sell parts so they increase their commission. Train and pay guys so they focus on quality rather than quantity of calls.
Re: System 2000, nearly double the cost of Weil McLain, is it worth it?
Weighing in as a home improvement contractor with many years experience dealing with much older homes in NY and MA. (FYI: My own house was built in the late 1700s in the Catskills, and she has gone from an energy hog to an energy-efficient house).
If you really wish to reduce your heating costs, follow any recommendations to deal with the heating load of your house. Load reducing improvements always offer the best bang for the buck (and most are permanent).
Reducing air leakage is easily the best bang for the buck.
Start with a home energy audit. The best time to have one done is in the colder months.
Re: Cold only leak?
Hot metal swells/expands. Colder metal shrinks. Generally that is the case with most materials. Gasket under the tankless coil plate? Start spraying or soaking the bolts on the plate with penetrating oil in preparation for removal.
Re: B & G Dou - Flo Valve??? Main loop Supply/ Return and Secondary loop Supply / Return
Couldn't have been that good or they would still be making them.
Re: Experience I had with a boiler tech and what I learned along the way.
Well done! I'm more of an installer than a service tech, but I try to service boilers that I install which has taught me a great deal more than any book ever would have. I usually turn down service calls from others simply due to the fact that I'm not a service tech and don't know enough to be good at what I do, but, on occasion I will take calls from folks who are at their wit's end with salesmen telling them they need a new boiler even though theirs is only 5 years old. I recently came across an old Weil McLain CG-4 system that had been "serviced" by 2 small local shops and one big corporate operation within a month's time but still had a terrible noise coming from the system on occasion and the basement never warmed up. One of the small shops replaced a relief valve, expansion tank, and tridicator gauge and said it was good to go, but small shop #2 and the corporate shop both told the homeowner (a 21 year old girl, first time homeowner) that she needed a new boiler to the tune of $11k and $18k. The burners were full of cat hair from the previous owners so I know none of them cleaned it, the original Taco 007 was squealing due to bad bearings, and the basement thermostat was bad. Somebody monkeyed with the gas valve and had the CO up to nearly 8000PPM (yes, eight thousand) which obviously was causing some issues, but I was able to clean it out, replace the circ, flush the system, replace the faulty stat, and adjust the gas valve back to proper spec in a matter of 4 hours. According to the homeowner, she had spent several thousand dollars on these "service" calls already and whether the previously replaced components were actually bad I don't know, but the original call was for the basement being cold and the noise which obviously none of them could figure out. Basic common sense is no longer a requirement to become a service tech, apparently… It's scary how many of these guys are running around performing "service" like this.
