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Calling my gas company has a similar effect to calling Google, or trying to speak to NBC by yelling at my television.

For sequential pipe, I think it's going to be a limit. If 30' of 3/4 can only supply 199,000 BTUs, no matter what pipe I put after that can't do more. It seems that the smaller pipe would control. Thus it matters if the big pipe is first. I'm assuming single pipe mixed size to the meter...

The Noritz NR662-OD is 120,000 BTU maximum. That's 5 gallons per minute, 1/2" gas line, and OK up to maybe 20 feet of 1/2" or 40 feet of 3/4" per specs. I'm still seeking a dynamic model that can be tuned to a lower maximum BTU based on examining the flame quality for a given gas pressure.

https://www.eco2waterheater.com/ SANCO₂ Water Heater, Generation 4, imported from Japan. The taller the tank, the better the COP. The refrigerant is sealed, so no greenhouse gas leaks, ever. Expensive, but just due to low volume of sales in the USA. Very common in Japan, where there are a...

Is there an accepted/reliable method of calculating expected gas flow for mixed diameter gas pipe? For example * 40 feet of 1", then 40' of 3/4" * 40 feet of 3/4" then 40' of 1" Would the second be limited only by the first run, e.g. 170,000 BTU/Hour?

There's so much misinformation on this topic. It's like every installer and inspector remembers something someone told them, and repeats it as gospel time and again. Here are some codes: The bottom of the water pipe, at points, shall be not less than 12 inches (305 mm) above the top of the...

The heat pump water heaters I use have a passive tank, and a separate condenser. If the tank leaks, no problem, just replace it. Just replace the anode rod every 5 years if you're concerned.

See above: three story condo.

Is there a flexible epoxy, to account for future shifts in the building. A hard epoxy may crack over time, repeating the cycle. I assume that's why lead was used in the first place, it can accommodate shifts.

Not to local code--- has to be metal. Only the joint is bad now, the pipes are all solid.

How is such a joint repacked "upside down" so to speak? I thought it involved pouring lead.

OP here: This joint has both rust and... on foggy mornings... wet rust. The rust appears limited to the outside of the pipe. The poured lead solution won't work, not unless gravity inversion equipment is included. That's a Y junction with the top of the Y pointed gravity DOWN. The Fernco...

How, and who, can still repair old oakum joints that are inverted. Situation is a 4" CI waste stack comes down from the roof above the top floor toilet in an condo. Just above the toilet, it branches downward for the tub. The walls and everything are all finished. mostly with tile. The three...

What would you suggest to replace this, on a solar thermal system, San Francisco area: The old one gave out after 40 years in service, and won't reliably close up after it's activated when the system is past capacity at the tank, and stops circulating.

So hard to tell these days, with firmly held beliefs on all sorts of subjects. The old convention was :-) for sarcasm.

The RU130iN is 130,000 BTU. The company tells me they may in the future offer a way to (in software) configure it down to lower numbers, in 10,000 BTU steps.

The tankless units have a burner range, perhaps 10,000 to 150,000 BTU. Are there any units that in software can be limited to 100,000 BTU max for example, thus allowing an existing gas line to work at reduced overall heating capacity?

That's misinformation. Not correct in any way shape or form.

Does anyone offer a supplemental stubby short anode rod, for cases where the anode can't be removed from the original spot? Such an anode might go int the drain port, with some sort of valve...

The piece of material in the bottom of the tank will likely just work as intended. State water heaters for commercial recommends simply chucking a piece of zinc into the bottom of their heaters (the tops are made such that you can't remove the anodes without replumbing the entire heater). I...