DHW savings not for LEED?

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The proposed design includes an instantaneous water heater, but I don't
think that counts in EAc1. Is this correct?

I couldn't find mention of DHW in 90.1appendixG so I'm beginning to think it
should not be modeled at all.

Also, there is no place to enter domestic hot water usage in the LEED online
template.

Thanks,

Timothy W. Hill

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Hi Tim,

"Domestic Hot Water" is coined "Service Hot Water" in 90.1. Check out Table G3.1, section 11 to start. Baseline efficiencies and such are sourced from chapter 7.

The LEED EAp2 excel template (last I used it - it's a living document that changes over time) includes inputs to describe what's modeled for proposed/baseline service hot water systems. The EAc1 template is set up to permit you to show differing consumptions for proposed vs. baseline in regards to service hot water.

If the proposed system is better than the minimum requirements for efficiency and/or standby losses (as applicable), you should be able to demonstrate some savings.

Best of luck!

~Nick
[cid:489575314 at 22072009-0ABB]

NICK CATON, P.E.

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The CaGBC adopted a "low flow" fixture credit for
SWH based on the old CBIP program. The original
intent was that low flow lavatories and showers
(lower than the building code minimum) would
receive credit. Unfortunately this was
interpreted by many to include process SHW loads
like janitor sinks (filling a bucket uses just as
much hot water whether the fixture is low flow or
not). As a result, SHW savings are often
overstated in LEED Canada submissions.

I am hopeful this loop hole will be closed at
some point but so far I haven't seen any movement in that direction.

>> Christopher Jones, P.Eng.

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Tim,

I am modeling my DHW savings as "exceptional calculations" which is allowed
in Appendix G.

Barry Howard, Leed AP

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