See Also Vented taps Oversink Vented Undersink Unvented Oversink Instant
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Vented water heaters do not store hot water at mains pressure, but operate instead by using vented (non-standard) taps to control the flow of cold water into the unit which displaces hot water out of the unit through the tap. These units can only supply a single outlet, and expansion of hot water can result in dripping from the hot tap as the unit heats up. Vented taps are not generally supplied with the heater and can represent a significant additional expense unless already available (for example where a water heater is purchased as a like-for-like replacement).
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Hyco Slimline Vented Water Heater and Vented Mixer Tap - 5L 2kW
The Hyco Handyflow Slimline Vented Under Sink Water Heater comes as a highly cost effective package which includes a vented mixer tap. 5L Capacity.
Complete with vented tap and hose. External temperature control. 2kW element. White corrosion proof case. Safety re-settable thermal cut out. Wall bracket included for fast installation. Suitable for single outlet only.
Capacity 5 Litres | Power 2 kW | Dimensions 400 x 270 x 180mm (H x W x D)
Size:
Single
Order Code:
HF05VC
Price:
£92.00
Price inc. VAT:
£108.10
Zip Tudor Undersink Single-Outlet Heater - 5L 2kW
Simple to install. Supplies hot water to a single outlet. Connects directly to the cold water supply. No need for expansion vessel or relief valve. Simple to operate. Temperature controlled water whenever you want it. Externally adjustable temperature control. Neon light indicates when heating element is "on".
Capacity 5 Litres | Power 2 kW | Dimensions 390 x 255 x 215mm (H x W x D)
Size:
Single
Order Code:
P452UB
Price:
£105.00
Price inc. VAT:
£123.38
Hyco Slimline Vented Water Heater and Vented Mixer Tap - 10L 2kW
The Hyco Handyflow Slimline Vented Under Sink Water Heater comes as a highly cost effective package which includes a vented mixer tap. 10L Capacity.
Complete with vented tap and hose. External temperature control. 2kW element. White corrosion proof case. Safety re-settable thermal cut out. Wall bracket included for fast installation. Suitable for single outlet only.
Capacity 10 Litres | Power 2 kW | Dimensions 450 x 310 x 180mm (H x W x D)
Size:
Single
Order Code:
HF10VC
Price:
£107.00
Price inc. VAT:
£125.73
Santon Aquarius Undersink Single-Outlet Water Heater - 7L 3kW
Under-the-sink Vented Water Heaters. If the water heater is supplied from the water mains, a vented tap or vented mixer must be used. This ensures that the water expansion during the heat up cycle is allowed to vent without restriction. Aquarius vented undersink units can also be supplied by a cold water cistern (feed tank). In such cases, the base of the cistern must be no higher than 10 metres above the top of the water heater and a vent pipe must be used. The 3kW element provides a fast recovery from cold.
Capacity 7 Litres | Power 3 kW | Dimensions 356 x 240 x 240mm (H x W x D)
Size:
Single
Order Code:
010008
Price:
£115.00
Price inc. VAT:
£135.13
Santon Aquarius Undersink Single-Outlet Water Heater - 7L 1.2kW
Under-the-sink Vented Water Heaters. If the water heater is supplied from the water mains, a vented tap or vented mixer must be used. This ensures that the water expansion during the heat up cycle is allowed to vent without restriction. Aquarius vented undersink units can also be supplied by a cold water cistern (feed tank). In such cases, the base of the cistern must be no higher than 10 metres above the top of the water heater and a vent pipe must be used. This 1.2kW version means that Aquarius can be fitted in situations where the power supply may be limited, such as portable or temporary buildings.
Capacity 7 Litres | Power 1.2 kW | Dimensions 356 x 240 x 240mm (H x W x D)
Size:
Single
Order Code:
010009
Price:
£115.00
Price inc. VAT:
£135.13
Zip Tudor Undersink Single-Outlet Water Heater - 10L 2kW
Capacity: 10L. Simple to install. Supplies hot water to a single outlet. Connects directly to the cold water supply. No need for expansion vessel or relief valve. Simple to operate. Temperature controlled water whenever you want it. Externally adjustable temperature control. Neon light indicates when heating element is "on".
Capacity 10 Litres | Power 2kW | Dimensions 455 x 310 x 265mm (H x W x D)
Size:
Single
Order Code:
P4102UB
Price:
£135.00
Price inc. VAT:
£158.63
Heatrae Sadia Streamline Single-Outlet Water Heater - 7L 1kW
An attractive, thermoplastic, under-the-sink Vented Water Heaters for use in conjunction with open outlet (vented) taps. Long life alloy-sheathed element. Externally adjustable (5-90°C) thermostat. 40°C temperature lock for hand-wash applications.
Capacity 7 Litres | Power 1kW | Dimensions 475 x 290 x 186mm (H x W x D)
Size:
Single
Order Code:
010180
Price:
£175.00
Price inc. VAT:
£205.63
Heatrae Sadia Streamline Single-Outlet Water Heater - 7L 3kW
An attractive, thermoplastic, under-the-sink Vented Water Heaters for use in conjunction with open outlet (vented) taps. Long life alloy-sheathed element. Externally adjustable (5-90°C) thermostat. 40°C temperature lock for hand-wash applications.
Capacity 7 Litres | Power 3kW | Dimensions 475 x 290 x 186mm (H x W x D)
Size:
Single
Order Code:
010182
Price:
£175.00
Price inc. VAT:
£205.63
Redring Contour 7000 Undersink Single-Outlet Water Heater - 7L 3kW
7 litre capacity, point of use. Adjustable thermostat 15C - 75C. Integral on/off and flow control. Frost protection setting. Choice of heat settings. Ideal handwash and dishwash temperature settings indicated on the unit. Tamperproof thermostat cover. Range of vented taps available. Proven long life copper element. Negligible standing heat loss.
Capacity 7 Litres | Power 3kW | Dimensions 466 x 286 x 165mm (H x W x D)
Size:
Single
Order Code:
784020
Price:
£177.00
Price inc. VAT:
£207.98
Santon Aquarius Undersink Single-Outlet Water Heater - 10L 3kW
Under-the-sink Vented Water Heaters. If the water heater is supplied from the water mains, a vented tap or vented mixer must be used. This ensures that the water expansion during the heat up cycle is allowed to vent without restriction. Aquarius vented undersink units can also be supplied by a cold water cistern (feed tank). In such cases, the base of the cistern must be no higher than 10 metres above the top of the water heater and a vent pipe must be used. The 3kW element provides a fast recovery from cold whereas.
Capacity 10 Litres | Power 3 kW | Dimensions 442 x 240 x 240mm (H x W x D)
Vented water heaters do not store hot water at mains pressure, but operate instead by using vented (non-standard) taps to control the flow of cold water into the unit which displaces hot water out of the unit through the tap. These units can only supply a single outlet, and expansion of hot water can result in dripping from the hot tap as the unit heats up. Vented taps are not generally supplied with the heater and can represent a significant additional expense unless already available (for example where a water heater is purchased as a like-for-like replacement). 
Vented taps 
The Hyco Handyflow Slimline Vented Under Sink Water Heater comes as a highly cost effective package which includes a vented mixer tap. 5L Capacity.
Complete with vented tap and hose. External temperature control. 2kW element. White corrosion proof case. Safety re-settable thermal cut out. Wall bracket included for fast installation. Suitable for single outlet only.
Simple to install. Supplies hot water to a single outlet. Connects directly to the cold water supply. No need for expansion vessel or relief valve. Simple to operate. Temperature controlled water whenever you want it. Externally adjustable temperature control. Neon light indicates when heating element is "on". 
Under-the-sink Vented Water Heaters. If the water heater is supplied from the water mains, a vented tap or vented mixer must be used. This ensures that the water expansion during the heat up cycle is allowed to vent without restriction. Aquarius vented undersink units can also be supplied by a cold water cistern (feed tank). In such cases, the base of the cistern must be no higher than 10 metres above the top of the water heater and a vent pipe must be used. The 3kW element provides a fast recovery from cold.
An attractive, thermoplastic, under-the-sink Vented Water Heaters for use in conjunction with open outlet (vented) taps. Long life alloy-sheathed element. Externally adjustable (5-90°C) thermostat. 40°C temperature lock for hand-wash applications.
7 litre capacity, point of use. Adjustable thermostat 15C - 75C. Integral on/off and flow control. Frost protection setting. Choice of heat settings. Ideal handwash and dishwash temperature settings indicated on the unit. Tamperproof thermostat cover. Range of vented taps available. Proven long life copper element. Negligible standing heat loss. 
