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Commercial Hot Water Tanks & BTU's
I have hired a contractor to replace a leaking Hot Water Tank (commercial), 100 gallons and 275K BTU. The contractor replaced it with a unit that did not have the ASME rating, and needs to be replaced as it did not pass inspection. I have suggested replacing the unit with a lower capacity, and lower BTU HWT. The contractor has implied that because the HWT is tied into a primary HWT (same capacity and size) that he can not dial down the BTU on just one unit. - "is he right"?
This building is a 46 unit residential apartment complex, centrally heated with 2 boilers. The HWT's are only used for faucets, showers, and central laundry. The units are all one bedroom & efficiencies. I do not believe the demand (even during peak hours) would necessitate 550K and 200 gallons.
So my question is "Is the contractor right"?
If my understanding is correct, the primary HWT tank fires and is used until its capacity is reached (it is set up in some sort of modulating capacity) and then the secondary unit is fired to supply additional hot water. Regardless both units are constantly keeping 200 gallons of water at 125 degrees when it is not all needed all the time.
I am getting the usage numbers from the building owners to run the numbers myself but have never heard of the BTU's needing to be the same on commercial hot water tanks when the are tied into together.