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Vlad · 05-01-12, 11:09 AM

Now when winter is over I can say that floors performed perfect. My original heat loss calculation required 50k BTU for heating. This winter I used my HWT as heat source. My HWT is 34000BTU input @65% efficiency gives only about 22k BTU output. We still use it for hot water. Even on coldest days @ -10C HWT was never working constantly. It was working for an hour and stopped for half an hour. Because we used hot water at the same time it was useless to measure time periods when it was working.

I put some sophisticated controls to control loop temperature and flow according to outside temperature. On coldest days loop temperature was about 95F. I set TD(supply-return) 6F. Most of the time loop temperature is 85-87F. When outside is +10C system shuts down.

Here are some pics of "boiler room"

Manifold:

Controls and storage tank on the left :

Pumps and piping note white cube behind storage tank is a plate heat exchanger inside foam insulation (primery loop is DHWT secondary loop is storage tank. Water from storage tank runs under floor.) :

05-01-12, 11:09 AM	#203
Vlad Apprentice EcoRenovator Join Date: Aug 2010 Location: Windsor ON Canada Posts: 229 Thanks: 4 Thanked 30 Times in 22 Posts	Performance Now when winter is over I can say that floors performed perfect. My original heat loss calculation required 50k BTU for heating. This winter I used my HWT as heat source. My HWT is 34000BTU input @65% efficiency gives only about 22k BTU output. We still use it for hot water. Even on coldest days @ -10C HWT was never working constantly. It was working for an hour and stopped for half an hour. Because we used hot water at the same time it was useless to measure time periods when it was working. I put some sophisticated controls to control loop temperature and flow according to outside temperature. On coldest days loop temperature was about 95F. I set TD(supply-return) 6F. Most of the time loop temperature is 85-87F. When outside is +10C system shuts down. Here are some pics of "boiler room" Manifold: Controls and storage tank on the left : Pumps and piping note white cube behind storage tank is a plate heat exchanger inside foam insulation (primery loop is DHWT secondary loop is storage tank. Water from storage tank runs under floor.) : Last edited by Vlad; 05-01-12 at 11:15 AM..