baseboard using a tankless coil

birdsalljoed

How many BTU's can I get out of an internal tankless coil if I'm running a baseboard loop at around 180-190 degrees

Zman

Model?

Which coil? Which boiler? GPM? I assume you are talking about a DHW coil inside a boiler?

birdsalljoed

tankless coil

Yes Z,



I thought there might be a "rule of thumb" when dealing with an internal boiler coil. EX: ? BTU's per GPM or something like that

Mark Eatherton

Caution...

The coils DHW rating is not the same as its space heating rating because in the DHW mode, you may have as much as a 140 degree delta T between the incoming water temperature and the boiler water temperature. In the space heating mode, the delta T (driving force) may be as low as 30 degrees (boiler 180, supply water = 160, return = 140).



A good manufacturer should be able to provide you with the performance data for their coil, based on real world operating parameters.



Is this a steam boiler or a hot water boiler?



ME

birdsalljoed

M.E.

ME,



It's not a specific job. I have many contractor customers that ask me my opinion. There is so much conflicting information out there depending on who you talk to. I want to give them an accurate answer

Mark Eatherton

There is only one correct answer.....

and that answer is "It depends", but you probably already knew that. ;-)



With so many boilers and heat exchanger combinations out there on the market, too many variables to have an easy answer.



Once you know the output capacity at the space heating savings in btuH, then you will have the answer to their questions. I assume you are in the wholesale end of things?



If you have a favorite boiler manufacturer, I am sure they can give you the answers you need.



ME