My Dad and I rigged up an electric hot water tank, without wiring the
electric, to be used as a storage tank, to supplement an undersized oil
fired heater 30 years ago. We had an electric pump circulate between the
furnace tank and the storage tank, whenever the burner fired.
Jack
-----Original Message-----
From: shop-talk-bounces@autox.team.net
[mailto:shop-talk-bounces@autox.team.net] On Behalf Of Jim Franklin
Sent: Friday, January 23, 2009 6:29 AM
To: Shop Talk
Subject: [Shop-talk] Hydronic system off a steam boiler?
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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