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Brian,
You missed the boat on this one. Since you already have the boiler, the most efficient, cost effective way to make domestic hot water is with an indirect hot water maker. Plumbed into the boiler as an additional zone. Water to water heat exchange, virtually endless hot water supply, incredibly good insulation (less than one degree heat loss per hour on our 40 gallon), negligible effect on oil consumption.
Jim
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2005 C240 4matic wagon (daily driver)
87 190D - 225K (on loan)
85 190D - 312K (on loan)
2011 Subaru Legacy AWD (Wife's)
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