I'm looking for a new system to provide heating and hot water for a 15-bed HMO (all rooms are ensuite) in a 5 storey building, 11m x 8m footprint (440m2).
CH: approx 20 rads + 15 towel rads (150,000 BTU approx)
DHW: 15 showers + kitchen
Assuming, no more than 10 people will shower at any...