Instantaneous LP HWH for radiant

klaus

These water heaters are designed for a large delta T. (cold water in, hot water out). Turning them into a boiler is asking them to operate w/ a small delta T, w/ lower efficencies, since the the heat exchanger cannot suck out of the flue gas what it used to.
So count on short cycling, and inefficient cycles.
Not worth it. Have tore out 4-5 of these and installed boilers. Customers could not wait to get rid of it, and love the fuel savings they now have. And most of these were a few years ago, before fuel prices went up.

John Abbott

Instantaneous

I have a customer who wants me to install radiant with a instantaneous LP HWH as the source this wold not be used for any domestic HW and the load is only 20K. Anyone with experience with a similar system? Any input would be appreciated

John

Derheatmeister

Not a good Ideal

I will not recommend doing this

I just removed a system like this ; It had only Problems!!

Check out the TT Prestige it has 60 K..

TimS

what is the Emitter?

I dont like them I have to service alot of them they usually have bigger boiler pump to overcome high head. inlet screen is so small can be a nuiscance keep plugging it up. with glycol you get noisy boiling noise . most all tankless i have seen are noisy too. often see installation issues . tankless heaters are at least 100k btu with modulation . there is more pet peeves that bug me about these type of installs . the common factor i see with these jobs is "cheap" one way or another and then they pay for me service these systems!

TimS

There are some jobs that I hear about they want me to come fix it then they cancel because they are too fed up and end up replacing it for something else .

John Abbott

emitters

The emmiters are concrete slab and plates under hardwood flooring on two floors respectively.
Thanks,
John