[Greenbuilding] Solar Water Heater architecture

[Chris Green]

wmdorsett at sbcglobal.net wrote:
> 3. I'm not sure what the difference is between ethynol and ethylene glycol.
> Why can't we just use Everclear?  
And I was wondering if perhaps canola oil or some other vegetable oil 
might work as the heat-transferring medium? It isn't quite as dense as 
water, but it can withstand temps up to around 360F, and in a closed 
loop system, it wouldn't be prone to going rancid for a long time. It's 
also not toxic and won't corrode the plumbing. .

Any thoughts on that?

Chris Green.