In article , wrote:

Do you care? Consider the case where one heater has poor insulation and a very
efficient burner, and the other has a poor burner and better insulation. Both
have the same EF, both cost the same to operate over a year. Which one do you
buy?

It depends on your usage. EF assumes typical usage patterns,
whatever that is.

If your usage is above typical, go for the better burner.
If your usage is below typical, go for the better insulation.

EF is not the holy grail, unless you actually know for a
fact that your usage patterns mirror those assumed in the
EF calculation.

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|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~|
| Malcolm Hoar "The more I practice, the luckier I get". |
| Gary Player. |
| http://www.malch.com/ Shpx gur PQN. |
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