Ron, I saw Harrishawk's original question. I'm no expert on the various alternatives, but I can offer a few observations.
I dislike LPG for several reasons.
The fuel is still, relatively, the most expensive.
Their technical siting requirements are extremely onerous unless you have plenty of garden around you. You can bury the tank, but that is ridiculously expensive.
Modern oil boilers (condensing) reach efficiencies better than 84%.
In the right circumstances, oil tanks can be sited right up to a building if necessary.
I'm working on a big 'ole Manor House at the moment. It has a pellet-fed boiler out in an outbuilding. I had a demo of it in action. Very impressive. It's controlled normally from inside the house. It's even fired up from indoors.
Pellets are easily obtainable. The advantage is that you can buy as big a load of pellets as you like, if you have the room. Economy of scale then.
Right next to the boiler is the biggest hot water storage tank I've ever seen. The boiler has only to keep this topped up.
I can imagine that, coupling this with solar water heating panels would create a pretty good system.