Boiler/hot water replacement options

A friend of mine has a vacation house in upstate NY that he uses maybe 3 days out of every 2 or 3 weeks. It currently has an oil fired boiler that needs to be replaced that supplies hot water heat and also serves as the water heater. Nat gas is not available. So, here are the options:
1 - Replace with another boiler that will do both, lowest install cost
2 - Replace with a boiler and seperate oil fired hot water heater, highest install cost
3 - Replace with a boiler and seperate electric water heater
Question is, which of these do you think is the best option?
The biggest apparent disadvantage with #1 is that during the warm months, when the boiler is not generating heat, this type of water heater is supposed to be the least efficient. However, with his limited usage model, this may not make that much difference. Also, he could turn the boiler off when he leaves in warm weather, turn it on again when he arrives, thereby keeping it from running to maintain hot water during 2 week periods when no one is there.
With either option 2 or 3, he could turn off the water heater when he leaves and then turn it on again when he arrives all year long. But if he did that, it would most likely mean that he would have to go with option 2, because otherwise it will take quite a while to get hot water.
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snipped-for-privacy@optonline.net wrote:

More options: 4 - Standard hot water heat boiler. Add a *zone* to heat a hot water storage tank.
5 - Switch to propane. Might be a favorable idea if the oil tank is underground and the current removal procedures are not onerous yet. Eventually they will be, cost a friend of mine $20,000 to *retire* his underground tank.
If it twere me, I'd go with option 1 because of the limited use. The newer boilers heat the water almost instantly. Two houses ago I had a newer oil fired furnace and could shower forever without running out of hot water.
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snipped-for-privacy@optonline.net Wrote:

It is probably time to truly assess the comfort heating needs and the domestic hot water needs. Consider separating the systems. Then look at the known available energy sources Propane (LPG) Electric Oil
Here are some 'Propane Tankless Water Heaters' (http://www.plumbersurplus.com/ProductList.aspx?Catr )
Here are some electric tankless water heaters. 'Stiebel Eltron Tempra 29 Tankless Water Heater' (http://www.plumbersurplus.com/ProductDetail.aspx?Prod 930&Cat)
'Stiebel Eltron Tempra 36 Tankless Water Heater' (http://www.plumbersurplus.com/ProductDetail.aspx?Prod 931&Cat)
--
PSZach

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