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Posted by Joe Brix on December 12, 2004 at 08:06:02:
In Reply to: BTU load available off tankless coil of boiler posted by Steve Garson on December 11, 2004 at 21:13:02:
While creating a hot water zone off a steam boiler is OK, I don't consider it the most efficent way of doing it. Now you're looking to feed both high temp and low temp zones off of a steam boiler. I think you'll see too much cycling. You may want to get an external tankless HW tank feed off the steam boiler to heat the hydronic and radiant zones. This will create a more tempered zone for the radiant zones to run longer without calling for steam cycles as frequently. Checkout www.tfi-everhot.com
A more efficent way would be a wall hung modulating condensing boiler to heat the zones and produce your hot water through an indirect HW heater. Leave the steam boiler for steam heat only.