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Re: Removing Hot Water Heater
Yes. If the heat exchanger in the water heater or any part of the plumbing between the engine and the water heater is located above the engine’s expansion tank cap, then a remote expansion tank must be plumbed into the system. If you remove the heater and all it's plumbing, the remote expansion tank is no longer necessary.
I would check with a Yanmar mechanic before installing stop cocks. I don't know whether the in/out ports are part of the flow pattern of the engine cooling system or not. It sounds like a good idea, though. If you look at my write up, I didn't have plugs to fit the ports and didn't feel like spending the money to buy them at the price of Yanmar parts, so I just doubled the hose back.
Last edited by DaveMancini; 07-19-2013 at 12:23 PM.
Reason: Addition and correction