Drainback with Baseboard [RE-wrenches]

[Jeremy Rodriguez]

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Dean, 
 
In bypassing the boiler I meant to bypass it with zone valves if the 
solar tank is up to temp to operate the baseboards. I have worked on 
some older systems that do just that. 
Example of one.  At 130 deg. the boiler supply is diverted through a 
coil in the solar tank (3-way) and a DPDT aquastat also opens the gas 
valve circuit.  I'm not sure this is the most efficient, but have seen 
it in quite a few older systems.
 
I have a lot of prospects with baseboard currently and a boiler who want 
to incorporate solar.
 
Another scenerio would be to bypass the boiler like I first mentioned 
with zone valves. (more reliable?)  and use the solar tank's coil to 
feed the baseboards. I know baseboards like 160-180 deg water temps, so 
it would seem to cool the solar tank quickly, even if set up to use 140 
or 150 deg water for the baseboards. When the tank cools below that temp 
the boiler loop would function as normal, correct.  Not very efficient, 
right?
 
What about the issues of low water temps returning to a boiler? Flue 
problems?
 
Should I stay away from baseboard apps. and just try to sell them on DHW 
pre-heat?
 
I just seems like there is a maket here for the baseboard world.  Maybe 
not
 
Thanks for your help
 
Jeremy

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