If the combined flow rates of both showers are likely to be > 15 litres/min, then installting via System B or System C can be considered. Consideration should therefore be given to the incoming water pressure and any other elements that may cause pressure drop on the system. If the total flow rate is over 14-16 litres/min, then you will be getting a pressure drop of around 0.8bar, in the event of both showers being used together. However, consideration also should be given to the total combined flow rates of the showers. as long as the pipe run fro the WWHRS pre-heat out, to the cold side of the shower is within 4.75m and the waste pipe run from the showers to the WWHRS are ideally under 3.0m. Two showers can physically be connected via System A. Yes, but there are a few things that you should consider: Q: Can Recoup WWHRS be installed to more than one shower? What we can advise is that according to Part H1 Foul Water Drainage, based on a 40mm waste pipe diameter, 3.0m maximum length from the shower trap to the discharge stack is allowed before venting of the waste pipe is required. The specifics of the sanitary pipe work layout and design would normally come from the architect, M&E of build services designer. However, as we (Recoup) are not normally involved in the specific M&E design of any given project it is impossible for us to give specific guidance or signoff for Part-H, other than to say “WWHRS must be installed with consideration to the most recent ‘Approved document – Part H of the Building Regulations’ for preventing the ingress of foul sewer gases.” As per our installation instructions. Part H, section 1 is applicable to sanitary pipework and is predominantly concerned with ensuring that the water seal or trap is not cleared during normal use, due to pressure differentials within the sanitary pipework. However, there may be a requirement to vent the waste drain pipe, if sufficiently long. There is no specific requirement for a HepVo trap, and we normally suggest that a standard ‘water trap’ is perfectly fine. Q: Is a normal shower waste (with a water trap) ok between the unit and shower tray? No HepVo trap or vent required?
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