Washroom Water Heaters

Over sink water heaters typically come in two varieties: storage water heaters, with various litre capacities and tankless water heaters. Storage water heaters store and repeatedly heat water within a tank, while tankless water heaters instantly heat the water as it flows through the device, and do not retain any water internally except for what is in the heat exchanger coil. They are typically used to provide hot water for sink taps and shower heads.

How do over sink water heaters work?

With traditional storage water heaters, once the water stored inside the tank has been heated, it may be streamed until it is depleted, at which point the new supply of water must be heated. With these heating devices, over sink water heaters tend to have a smaller tank than a typical boiler.

Tankless water heaters are typically installed near their point of use. Unlike storage water heaters, these devices offer a plentiful continuous flow of hot water and potential energy savings thanks to their greater efficiency.

Types of over sink water heaters

Certain models of over sink water heaters are intended to be installed in specific locations, such as under a sink. Many, but not all, feature a component for temperature control such as a knob. They are available to buy with different litre capacities depending upon your requirements.

All water heaters that burn gas need to be adequately vented.


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Description Price Water Capacity Power Rating Supply Voltage Connection Maximum Working Pressure Thread Size Thread Standard Maximum Operating Temperature Product Depth Product Height Type
RS Stock No. 875-0264
Mfr. Part No.43678901
BrandRedring
SGD143.86
Each
units
- 3kW - - 7 bar - - - 83.5mm 228.5mm -
RS Stock No. 124-1513
Mfr. Part No.47789201
BrandRedring
SGD673.09
Each
units
15L 3kW 240 V 1/2 in BSP 12 bar 1/2in BSP +70°C 300mm 360mm Unvented Water Storage Heater
RS Stock No. 124-3839
Mfr. Part No.47789601
BrandRedring
SGD261.35
Each
units
15L 2kW - 1/2 in G 6 bar 1/2in G +70°C 310mm 410mm Unvented Water Storage Heater
RS Stock No. 124-3836
Mfr. Part No.45673202
BrandRedring
SGD286.27
Each
units
- 10.8kW - - 10 bar - - - 84mm 160mm Unvented Water Storage Heater
RS Stock No. 124-3838
Mfr. Part No.47789501
BrandRedring
SGD243.84
Each
units
10L 2kW - 1/2 in G 6 bar 1/2in G +70°C 250mm 410mm Unvented Water Storage Heater
RS Stock No. 124-1512
Mfr. Part No.47789101
BrandRedring
SGD611.91
Each
units
10L 3kW 240 V 1/2 in BSP 12 bar 1/2in BSP +70°C 254mm 360mm Unvented Water Storage Heater
RS Stock No. 124-3837
Mfr. Part No.22679301
BrandRedring
SGD175.38
Each
units
6L 1.5kW - 1/2 in BSP Male 8 bar - BSP - 255mm 270mm -
RS Stock No. 875-0267
Mfr. Part No.43679901
BrandRedring
SGD279.12
Each
units
- 3kW - - 7 bar - - - 83.5mm 228.5mm -
RS Stock No. 124-1515
Mfr. Part No.47789401
BrandRedring
SGD468.19
Each
units
15L 3kW 240 V 1/2 in BSP 12 bar 1/2in BSP +70°C 300mm 360mm Unvented Water Storage Heater
RS Stock No. 124-3835
Mfr. Part No.45673201
BrandRedring
SGD277.31
Each
units
- 9.5kW - - 10 bar - - - 84mm 160mm Unvented Water Storage Heater
RS Stock No. 124-1514
Mfr. Part No.47789301
BrandRedring
SGD425.61
Each
units
10L 3kW 240 V 1/2 in BSP 12 bar 1/2in BSP +70°C 254mm 360mm Unvented Water Storage Heater