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Vie$$man Dual Coil Vitocell 100-B used for DHW & boiler buffer tank?

billyboy Member Posts: 152
I have a New Dual coil Vitocell 100-B

I'm thinking of using top coil for radiant heating system?
I may need a circulator between DHW port and RT port to increase heat transfer into the top coil?

pg. 6

RT port is the DHW re-circulation return into tank at about the middle of the top coil

top coil = .9M2 = 9.7Ft2

top coil with 26KW boiler input (26,643 btu/h) at 80*C will raise 638 liters/h (168 g/h) from 10*C -> 45*C (35*C increase = 63*F)

168 x 8.3 x 63 = 87,847 btu/h

My system requirement is small @ 24MBH @ -20*F

The circulator from DHW to RT would only create circulation within the top 1/3 of tank, not out to fixtures.
This flow around the top coil will increase heat transfer into coil.

This is the benefit: The Vitocell 100-B will act as a buffer tank for boiler and provide DHW.

Here is my plan, Burnham RV3 CI boiler will heat tank via bottom coil, under control of tank aquastat.

At my high altitude (8,800') this will create long efficient burn cycles.

My DHW will be provided by the 79 gal. contained in tank.
My 4 zone system can sip heat out of tank as required by thermostats.

As I only need about 1/3 as much heat out as what the top coil could put into tank, I think it's possible.
Have U ever heard of someone trying this?

Thanks BBP