Choosing a boiler will really depend on what type of fuel you wish to use. Even the difference in wood pellet or wood chip will have a profound effect on specific parts of the boiler, this should determine the type of internal arrangement (Underfed stoker or stepped grate) that needs be used as well as auger sizes, this is because the moisture and size of the two fuels are very different. You should also look closely into the ongoing operating cost along with heat losses if you plan on utilizing a district heating network, as well as the heat demand/load profile to size the boiler correctly. Also unlike oil, you wont just be able to scroll through the yellow pages and call out a delivery of wood chip/pellet at a moments notice, it is therefore essential that you or your installer set up a relationship with a couple of local suppliers.
Then once you have the correct information available to you, it would be wise to get your installer to look specifically at how your installation will fit with the demands of the renewable heat incentive, if they are a competent installer they should be able to show you models of the expected return on your initial financial investment.
John
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