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Electric flr heating in passive design

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Posted by Roy Mock on July 3, 2003, 8:27 am
Given a passive design with concrete floor [no carpet or timber on top], is
it a conflict-of-interest if an electric floor heating system is installed
so that the feet don't feel the cold floor?

Posted by Steve Spence on July 3, 2003, 10:45 am
Why electric? Why not solar heated hot water with wood backup?


Steve Spence

Posted by Roy Mock on July 3, 2003, 3:35 pm
 Wood fuel heaters are banned where I am [for air pollution reasons I think].

I haven't heard of solar heated water floor heater suppliers.  Interesting
thought though.  There is no guarentee of solar access in suburban urban
areas in valleys.  That you mention wood backup indicates that it may not be
efficient.  I suppose we could use gas backup instead - would sugest gas
boosted solar hot water? or on a separate system?

Otherwise electricity is client choice because of advertising by local


Posted by davehinz on July 3, 2003, 7:00 pm
I think we all need to reread that sentence and understand the

Is there any way you can sign up for a "time of use" plan for your
electricity?  Here, I can get off-peak-time electricity for 1/6th of
the daytime rate, so it makes sense for me to heat with electricity at
night and on weekends, and with propane during the days.  It's simply
a case of a timer/switch to turn off the electricity when it's expensive.
Not sure if that helps, if you can't buy your electricity that way.
Your slab can reasonably be warmed at somewhere around 1 degree per
hour (a vastly oversimplified guess but close enough to make the point),
so you can store quite a bit of heat in that thermal mass.

Dave Hinz

Posted by Roy Mock on July 3, 2003, 9:12 pm


Yes, we have off-peak rates.

Thnx for your reply.

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