Best Of
Re: grohe smart " stupid box"
This isn't a problem exclusive to Symmons. However. Symmons shower valves are extremely reliable and repair better than any other I have seen. The spout drip on a Symmons is a repair that takes well with a high success rate. Other shower valves…not as much.

Re: The "equalizer" is mis-named. It does nothing to equalize anything.
I would use 45s if possible. Try to avoid 90s above the water line. Below the water line anything goes.
Re: New Build
The first step is a heat load calculation for the various buildings/ rooms. Then choices like heat emitters, boilers, tube size come into play. Step two is the design of the system based on the loads.
You can try a load calc yourself, many wholesalers do them as well as reps or the radiant tube manufacturers directly.
Them Uponor design manual would be a good first read. It takes you through the steps.

Re: The "equalizer" is mis-named. It does nothing to equalize anything.
@ethicalpaul
time to buy more glass pipe and show us right or wrong

Re: Packing Heat
The only solar thermal heating besides pool heaters that I've seen operating for years is direct air heating. I forget the name of the company. It blew solar heated air into industrial buildings where ~60° sufficed. When sun did not shine then good old NG kicked in. If your entire roof is covered with solar panels then you save something on your A/C use. Otherwise Contrarion & Kaos observations match mine.

Re: Thinking of buying a spare used oil burner
It's not a terrible idea. However most parts on standard oil burners are interchangeable and is much easier than swopping the entire burner. Using it for a parts burner might be your better option.

Re: Replumbing: Solder or Threads for Ball Valves
Still waiting for evidence that shark bite fittings fail more than sweated or threaded…
Re: System 2000, nearly double the cost of Weil McLain, is it worth it?
I'll keep it simple guys, 48 years in the field, installation and 24/7/365 service. We installed EKs for 15 years, over 1000, maybe 2000. 100% customer satisfaction. When you deal with oil customers on a service contract you hear it if ANYTHING is wrong. Even replacements of fairly modern low mass boilers (WM468, Peerless ect03,4, et al), have had substantial fuel savings. Tech support has always been excellent, though rarely needed. These are the facts men.
Re: 1972 HB Smith OHB13W-7T 7 Section Combustion Chamber Replacement
Your as low as you should go with the stack temp. 325 net is it.
The general rule of thumb is around 100 deg over water temp.
You may get flue gas condensation if you go lower.
Re: Circulators with IFC internal flow checks, some discovery.
If someone was getting ghost flow, the ifc failing would be one of the last things I would think of but apparently it should be the first.
