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Adding an Indirect to an existing Burnham boiler
I decided to start a new thread on this subject, I'm new at this and hope it is correct forum etiquette. I copied and pasted my post from another thread here titled :
Glass Lined versus Stainless Steel - Indirect HW Heater started by rsc92
Thanks for the lesson on Recovery Rates. I appreciate your assistance.
I did not intend to hijack this thread, but didn't know if I should start a new one.
The existing boiler is a Burnham. The label on the jacket says "V8
Series low pressure boiler", Model 85WFH. D.O.E. heating cap 164,
I contacted Burnham asking for a manual. They emailed me the pdf version
for the V7 Series, stating that the 85WFH is a warranty replacement
block, jacket , and canopy for the V7 boiler. So, I am assuming the
rating label on the jacket refers to the new block.
Using your lesson in calculating the max. gpm this boiler can produce I
came up with 5.46 gpm (using a delta T of 60) and 4.68 gpm (using a
delta T of 70, well water in CT at 50?).
To do the calculation I used 164,000/500= 328/60= 5.46 gpm for 60 degree water
and 328/70= 4.68 gpm for 50 degree feed water. Did I do this correctly based on the ratings of the boiler?
So, for example, if I chose to go with an indirect like the Triangle
Tube Smart 50, its specs state a boiler output of 140,000 BTU and
Peak/Flow (gal/10 min.) : 65 (6.5 gpm?), the boiler would still only be
able to produce 4.68 gpm with a 50 degree water supply and the max. the
Smart 50 could produce would be 6.5 gpm if my supply water was 70
You stated that an oversized indirect can drag the boiler temps down and
cause condensation if the boiler is not piped correctly. I don't know
if this is a condensing boiler or not and would appreciate any input on
how you would set up an indirect with this boiler. I assume my plumber
will have this knowledge. I'm just trying to learn from others prior to
choosing an indirect and also want to know how best to hook one up.
I am guessing that we will be bypassing the existing tankless coil in
the boiler and that we will add a zone for the indirect. Do you pull the
existing tankless coil and replace it with a cover plate with access
ports and hook the indirect up there? Or, do you just cap the the
existing tankless ports and add a zone valve or an additional
circulator? BTW, the Burnham rep I contacted did state that I would need
to call their inside tech. dept. to ask them these questions.
Right now the existing boiler has one circulator and 6 zone valves. I've
read some articles about making the indirect a priority, but don't
really understand how this is done. Any advice or insights are really