Singapore legislation
Regulation 20
Regulation 20
Requirements for installation of hot water apparatus
Subregulation 1
An approved person must not install, or cause or permit to be or to remain installed, any hot water apparatus unless the hot water apparatus is fitted with an adequate device or constructed —
so as to prevent any backflow of piped water suitable for drinking to —
the hot water apparatus; or
any pipe conveying piped water suitable for drinking supplied by the approved person; and
so as not to cause any contamination, or any other adverse effect on the quality, of any piped water suitable for drinking supplied by the approved person.
Subregulation 2
Where an approved person installs any water heater on the approved person’s premises to heat the approved person’s supply of piped water suitable for drinking, the approved person must not connect, or cause or permit to be or to remain connected, any mixing valve, pipe or other water fitting in which hot water and cold water are mixed, so as to mix —
water supplied from the water heater connected directly to a service pipe, with cold water not supplied directly from a service pipe; or
water supplied from the water heater not connected directly to a service pipe, with cold water supplied from a service pipe.