There are several types of mixer tap, so called because they have two inlets and only one outlet. There are major differences between them, and the correct type must be selected to comply with the Water Byelaws.
Mixers may have divided flows, where the mixing only occurs at the end of the spout, or they may be designed so that the hot and cold water mixes in the body of the unit. If the hot and cold water are both supplied from a cold water cistern, either type may be used. However, if the cold water comes from the mains supply, and the hot water from the cold storage cistern, only the divided-flow type may be used.
If both hot and cold water come direct from the mains, either type of mixer may be used, but if the unit is a bath/shower mixer with a flexible hose, each supply pipe, or the shower hose, must be fitted with a double check valve to eliminate any possibility of back~siphOflage. This assumes that an air gap exists between the tap outlet and the overflow level of the basin or bath. If not, double check valves must be fitted to the pipes from the mains.
The single-hole mixer usually has supply pipes of 12mm, or possibly 15mm, diameter and may, or may not, incorporate a connection for a pop-up waste. Three-hole mixers are similar to two-hole mixers, but have the extra hole for a pop-up waste.
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| Mixer Taps |
Most two- and three-hole mixers have screwed BSP connections, but most single-hole mixers have plain (or plated) copper tube. Basin mixers have inlets at 102 or 210mm (4 or 8in) centres, and bath mixers at 18 1mm (7¼in) centres.
Two- and three-hole mixers have normal tap heads, or levers, on each supply to control the flow. Single-hole mixers may be operated by separate tap heads on each supply, or by the more modem single lever. The latter controls both the rate of flow and the mixing proportions of hot and cold water in the one action.
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