Coldframe Heaters for Greenhouse?

WG. · « **Reply #15 on:** February 19, 2007, 22:59 »

Don't want to be a killjoy but I see some problems

1. expense of installation. Won't the water need to be piped back to return to the existing drain / soakaway? SEPA are a mighty powerful body these days

2. freezing in winter?

3. you'd need to take a shower EVERY DAY to notice any benefit :shock: :shock: :shock:

You are both scientific types ... is there really that much heat energy contained in the volume of water required to take a shower? What d'ya reckon the exit temperature is at the plughole ... 30 degs C maybe??

Salkeela · « **Reply #16 on:** February 19, 2007, 23:09 »

Okay

1. OH very capable with stuff and cheap to pay (loves home made soup... :cool: ). We have our own septic tank and the drain water could connect in lower down easily.

2. The patio remains unfrozen in winter already - this is the south facing wall of an area with 2 other sides to it. Passion flower lives growing up one wall here!

3. I have four children - no problem!

Okay the heating bit. Water takes a lot of energy to heat (4.2joules to raise 1ml by 1 degree Celcius), meaning it releases a lot of energy as it cools. Freezing water releases even more energy (the reverse amount is needed to thaw it).

So really we are not talking a very warm frame.... may be tepid would be a better description. But it would give plants an edge I think....

... whether it would be enough of an edge to warrent doing it is another matter!

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Coldframe Heaters for Greenhouse?

WG.