We are going to have a ground floor plant room (1900 wide x 2150 deep) in which we will put the MVHR unit. We are also installing a gas boiler for DHW but I'm not sure where to install it - either in the plant room with the MVHR unit or in the utility room. My concern is around the necessary separation of the MVHR inlet and the flue for the gas boiler. Does anyone know what the regulations state and what is actually required in practise? I have a feeling that any regulation, should one exist, might not be good enough rather than too much!