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Literally used as a substitute for a conventional gas boiler, biomass boilers offer the same high-temperature output but with the benefit of being fuelled by a sustainable, carbon-neutral resource. They can burn logs, pellets or chips (the latter is usually reserved for larger buildings or communal heating), and provide 100% of the power required for both heating and hot water systems.
As well as considering the pros and cons of biomass in terms of your build, you should bear in mind the residents' need for information about living with a biomass boiler. Pellet boilers can run automatically, in much the same was as oil or gas boilers operate, but those fuelled with logs will require hand-filling. Logs may also require a larger storage area than pellets, but they can be cheaper than pellets if the supply is local – costs can be kept down even further if they are bought unseasoned, and left for a year before use. The best way to keep pellet costs down is to buy in bulk, but again, this will depend on the available storage space. It's important that they understand the implications, as well as the benefits, of having a home with this type of technology installed.
There are also some financial incentives for biomass boilers. The Government's Renewable Heat Incentive (RHI) has been extended to include homes, and offers a tariff to those who install certain types of renewables on their homes. Only some biomass boilers on the market are registered under the Microgeneration Certification Scheme (MCS), and an accredited product has to be installed by an accredited installer to qualify for the RHI payments. These payments only run for 7 years, but are intended to pay for the additional capital costs of the system, over and above that of a traditional heating system, during this time.