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The top of the line residential on demand water heaters can run between 7 and 9 gallons per minute at 199,900 BTU. All water heaters perform roughly the same job-- they raise the incoming water approximately 30 degrees C at a rate sufficient to support at minimum 2.5 gallons of water being used per minute. This is about 16,600 BTU.
Natural gas water heaters utilize a single burner to heat up to 65 gallons of water, depending on the size of the tank. Water heaters are fairly durable and can provide years of trouble-free service. Over time, however, gas water heaters can develop leaks an other internal problems. Many problems can be repaired, but the costs of repairs can eventually exceed the cost of simply replacing the water heater. Thankfully, replacing a natural gas water heater is a straightforward process.
you want your cold line coming tying into both inlets on the water heaters and the hot lines tied onto the outlet side of the water heaters evenly (so they get even draw and one water heater doesen't have to work harder tnan the other). your recirc line coming in ties into the cold line in beetween the two water heaters with a circ pump going twards the cold line and the other end of the circ line tying into the hot line on the furthest fixture. on the cold line coming in you need a ball valve, check valve and expansion tank before it ties into any of the heaters. NOTE: The solution above is for tanks in parallel not in series.
You can find in-line water heaters at any of the Home Depots in NYC, or at just about any plumbing or electrical store.
There should be a line indicating how far they go down in the water
Do you have one of those old green and white Westinghouse water heaters? How about the Kenmore slim tank version that came out a few decades back? Those water heaters were classics, and many of them are still working just fine, but are you spending more than you need to on hot water?
If it has one it should be on the cold water side at the top of the tank. All heaters do not have one and the main water line has to be shut off instead.
Yes, 1/2 inch supply to fill boiler will work fine. Piping going to baseboard heaters needs to be sized properly. 1/2 inch piping to baseboard heaters not recommended. Most hot water baseboard heaters piped with 3/4 pipe.
No, hot water heaters don't typically have a smell. If you are smelling fumes, you could have a leak in your gas line.
They will work co-dependently.
Hardware stores, Ebay, and Heating and Air Conditioning stores all carry Reznor line of heaters. Researching the sites that sell the Reznor line of heaters is quite easy and the use of a shopping and comparison site should help you in your search.
Consumer reviews list several gas hot water heaters at the top of their list. Among them are Rheem, Reliance and Eccotemp. You can find a complete line of water heaters at stores such as Home Depot or Lowe's.