HomeDad,
Do you mean winter-summer hookup? That's what we have on our oil burner. Makes plenty of hot water on demand, though for our upstairs bathroom it may take a minute or so for the hot water to flow that far. Plus - you never run out of hot water once it starts flowing!
If you're talking about a stand-alone water on demand heater, the closest I've used is a portable camp shower gizmo. Hooks up to propane and pumps/heats the water simultaneously. The one we used has 2 burners, but only 1 burner is necessary for hot enough water for a shower.
If none of the above - sorry can't help ya there!
- JasonEuc
M50's, CC370, M3's, Rotel RSX-965, Integra DPC 7.5, Harmony 688
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