Thought I'd toss this out there in case any boiler people were
lurking...
I have a steam system serving my first floor. It also provides
domestic hot water by heating a SuperStor tank, feeding boiler water
to the SuperStor coil.
I'm adding 3 hydronic zones to the house- a small laundry room in the
basement, a 250 sf addition off the kitchen, and a 1000 sf 2nd story.
I have the BTUs available in the boiler (31,000).
I'd like to supply the hydronic zones from a storage tank that was
heated by the boiler much like the indirect DHW, but the indirects are
really pricy. A 45 gallon SuperStor is about $900, an 80 gallon is
$1800! (add in a 2nd coil for solar and it's $2700. Jeebus.). And
since they are designed for high transfer rate of DHW, I think they're
overkill. But I haven't found anything less intense.
Has anyone used a different storage tank for this application? Say, a
burned out electric water heater? I could use the tankless coil
included with the boiler to heat the storage tank; it's supposed to
give me 4.5 gal/min of boiler-temp water, which will recharge BTUs in
26 minutes with a 30 degree temp diff. A 60 gallon tank would require
3 recharges per hour, about 10 mins each. (hope my math is right, it's
stll early)
thanks,
jim
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