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NC-2009 EAp2:Minimum Energy Performance

Gas Instantaneous Water Heater

Hello, I’m working in an office building in Bogotá, Colombia. The building has 11 gas instantaneous water heaters, with 48 kW capacity each. As you know, this equipment is included in 7.8 table of ASHRAE 90.1 2007, in the category “Gas Instantaneous water heaters - 200,000 Btu/h”, the minimum performance required for this equipment is 0.62 EF (Energy Factor). Due to the equipment does not store hot water, May I assume that the equipment operates with a thermal efficiency equal to the Energy factor, it means, equal to 0.62? Thank you

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Thu, 10/13/2016 - 13:34

Yes if they have no storage at all. However they usually have some minimal storage so you need to account for it in the EF formula.

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