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Posted by HeatPro on July 20, 2006 at 22:51:26:
In Reply to: downside to secondary boiler posted by soffle on July 20, 2006 at 19:42:40:
No particular downsides to it.
However, you need a separate flue for the wood boiler than the oil burner.
You don't need to twizzle valves if you install the boilers in parallel and then use a separate pump and flow control valve
http://www.heatpro.us/multctree/index.html
with each one so the water from one won't go backwards through the other.