domestic and radiant with an on demand

Sol Hydronics

I have found a plumbing diagram to plumb an on demand for radiant and domestic by Takagi but I dont like it since all the water goes through the flat plate exchanger. Would anyone have any good ideas for this application. Oh ya this is the home owners idea and not my recomendation. Thanks, mike

Sol Hydronics

no response

It looks like no one has any good ideas for this application

Alan (California Radiant) Forbes

Radiant w/ Indirect

No diagram; only a photo using a Taco X-Pump Block and a Noritz indirect.

Sol Hydronics

Thanks

I see the pic, nice work, and is this also taking care of domestic?, mike

Alan (California Radiant) Forbes

Domestic

Yes, it is.  Here is a better picture showing the domestic lines on the right side of the indirect.

Charlie from wmass

Please check your local codes

while Alan has done a great job here it would not be allowed in Massachusetts due to the plumbing code.

Alan (California Radiant) Forbes

Mass.

I know you have some strict codes, but if Noritz, Takagi and/or Rinnai approve the use for combined DHW/radiant, what in the code prevents it?

Mark Eatherton

I'm thinking, he's thinking, you're thinking......

I'll bet he thinks you're doing a direct with potable water, and not using the heat exchangers that you are.



But who knows for sure, it is after all, the peoples republic of Massachusetts. :-)



ME

Charlie from wmass

Yes Mark

I was thinking the domestic and the radiant water were common.

Alan (California Radiant) Forbes

Heaven forbid

I've done one open system in my life; 20 years ago when I didn't know any  better.



There's a single wall heat exchanger (HX) in that Taco X-Pump Block.  Yewsta'  be that you couldn't install a single wall HX in Oakland or SF per the Uniform Plumbing Code, but they allow them now, thank goodness.



You got anything against single wall HX's out there in Mass.?

Charlie from wmass

I do but code don't

Just kidding Alan. Nice neat job and glad you straightened me out on the facts.