domestic biomass boilers cost
Cost â Biomass versus conventional boilers. Biomass boilers start at about Â£7,000 for a 12kW domestic version â which is sufficient to provide heat and hot water for a 4-bed house.A comparable sized gas boiler will only cost Â£2500 to install. A bigger biomass boiler with an auto-feed hopper may cost closer to Â£12,000.ost â Biomass versus conventional boilers. Biomass boilers start at about Â£7,000 for a 12kW domestic version â which is sufficient to provide heat and hot water for a 4-bed house.