Explanation of EN1717 Water Regulations compliance.
Yes. Unlike some other WWHRS systems, we use double-walled copper heat exchangers that directly comply with EN1717 (EU/UK water regulations).
Whilst a single-walled WWHRS heat exchanger can be used in the UK, to comply with Water Regulations it must have a trap installed downstream of the unit, not before it (Normally a trap is installed under the bath or shower tray, so before the WWHRS). This can have the following implications/issues, particularly for, but not restricted to, vertical WWHRS systems…
Traps are a common area for blockages; the trap would need to be easily accessible through the base of any boxing on the floor below the shower. If the trap does block, draining a vertical exchanger (usually over 2m long) is very problematic once installed.
Additional shower noise could be generated internally from falling water going down the WWHRS unit and hitting the retained water in the trap at the base of the exchanger.
Popular low-profile shower trays usually have integrated shower traps. A trap at both ends of a WWHRS exchanger will create an air block between them. Either low-profile shower trays cannot be used, the trap needs to be removed from it, or additional venting needs to be designed into the installation to prevent the air block from occurring. The install height required to accommodate the trap, connectors, and any venting is very likely to increase, significantly in some situations. With the more efficient, long, vertical exchangers this is very likely to cause installation issues in rooms with standard ceiling heights. These restrictions, costs, additional design and installation considerations, and possible future problems can simply be avoided by selecting a WWHRS system that has a double-walled heat exchanger. The overall costs and possible future implications of the installation will be lower and end users can have greater peace of mind with the product that has been installed. This is why all Recoup WWHRS products are double-walled heat exchangers.