Return temperature question

[mousenut]

Please excuse my "newbism" if this is a dumb question

If I need to supply ~130 deg water to my radiant ceiling and ~140 deg to some panel rads, how do you protect the boiler from thermal shock? I understand that the supply water will need to be mixed, but what temps would the boiler have to run at to supply these and still maintain protection? I am looking to replace my oil boiler with something, just doing a ton of research before I commit to anything. After doing some reading at heatinghelp.com, I learned that I have been running my supply way too hot. Again, I apologize if this is a dumb question, just trying to learn.

Regards,

Ryan

 

[woodmaster]

I have a Tarm that is piped with some thermostats called "Termovar" 's that control the temps that return to the boiler. Basically they are similar to your auto engine thermostats. Some run with out.

 

[SteveJ]

Here is a link to check out on the Termovar (just to add to the ton of research )

http://www.acaso.se/english/termovar_laddningsventil.htm

 

[jebatty]

You might be asking two questions. To meet your supply needs at two different temperatures, you will need mixing valves to temper down the hotter boiler supply to what you require. The Termovar is a separate mixing vale plumbed between the boiler supply and return to insure that the return to the boiler is not too cold. In other words, it mixes hot boiler supply with cool boiler return to maintain 130+ or so return to the boiler.