"I have been using Rheem or State or Brad/white PVC flued tank type hot water heater…"
ducted heater
Hi again,
This is a great place to learn, thank you all that have answered my questions. Here is the next one. I just completed an audit and they only have a heater that is ducted because they are in a beach community. It was very leaky, but leaky compared to what??? I have read through my BPI and can't find some kind of multiplier for heater duct leakage
Judi
Views: 12
Replies to This Discussion
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Permalink Reply by Timothy Fisher on -
Duct leakage is leakage. I always apply the 6 cfm per 100 sqft energy star leakage standard for the ducts that I work with. The main difference in heating and cooling is in expected air flow of the two system types which vary.
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Permalink Reply by Rick Powell on -
21.7 times the OUTPUT btu= cfm for heat Example: 100,000 btu furnace input 80,000 btu furnace output. 80% efficient.
21.7 X 80=1736 cfm supply for heat. You have to go outside BPI for these formula's. Try national comfort institute. The 80 comes from dropping the zero's from 80,000 btu
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Permalink Reply by Judi Lyall on -
thank you both, ahhh I forgot my HERS stuff. Yes, when I saw 21.7 I remembered HERS. See somtimes a little nudge is all we need. I guess I couldn't think of putting HERS and BPI together. Thanks much appreciated.
Judi
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