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12 Litre External Expansion Vessel (DHW) - Zilmet
12 Litre External Expansion Vessel (DHW) - Zilmet
Zilmet 12 Litre External Expansion Vessel Potable expansion vessel for use on unvented domestic hot water systems Specification: Precharged to 3 bar Suitable for sanitary applications Compatible with cylinder sizes 90L to 150L Integrated fixing bracket

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£44.80 ex VAT
(£53.76 inc VAT)
15 x 20mm Acetal Tundish - Altecnic
15 x 20mm Acetal Tundish - Altecnic
Altecnic 15 x 20mm Acetal Tundish Used on unvented domestic heating systems, the open funnel offers visibility of system discharge, due to a fault condition within the heating system. Suitable for most unvented cylinders including Ultrasteel, Tribune HE, RM, Megaflo, ThermaQ cylinders Specification: Engineering grade polymer 15mm x 22mm connections,
£10.77 ex VAT
(£12.92 inc VAT)

18 Litre External Expansion Vessel (DHW) - Zilmet
18 Litre External Expansion Vessel (DHW) - Zilmet
Zilmet 18 Litre External Expansion Vessel Potable expansion vessel for use on unvented domestic hot water systems Specification: Precharged to 3 bar Suitable for sanitary applications Compatible with cylinder sizes 180L to 250L Integrated fixing bracket

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£47.64 ex VAT
(£57.17 inc VAT)
25 Litre External Expansion Vessel (DHW) - Zilmet
25 Litre External Expansion Vessel (DHW) - Zilmet
Zilmet 25 Litre External Expansion Vessel Potable expansion vessel for use on unvented domestic hot water systems Specification: Precharged to 3 bar Suitable for sanitary applications Compatible with cylinder size 300L Integrated fixing bracket
£57.28 ex VAT
(£68.74 inc VAT)

Altecnic ERES Auto By-Pass Valve 22mm
Altecnic ERES Auto By-Pass Valve 22mm
Altecnic ERES Auto By-Pass Valve 22mm Angle pattern differential pressure valve automaticaly regulates pressure in seald heating systems Specification: Nickel plated brass valves Adjustment range 0.1 to 0.5 bar 22mm connections Reduces heating system noise
£20.42 ex VAT
(£24.50 inc VAT)
Altecnic ERES Filling Loop 15mm Compression Connections
Altecnic ERES Filling Loop 15mm Compression Connections
Altecnic ERES Filling loop 15mm compression connections Includes screwdriver service valve and a combind double check & ball valve, complies with BS EN 1252.2 Specification: Nickel plated DZR Brass valves Stainless steel braid flexi hose 9.5mm EPDM rubber inner tube Supplied with x1 filling loop cap
£19.28 ex VAT
(£23.14 inc VAT)

Altecnic Temperature & Pressure Relief Valve 15mm x 1/2'
Altecnic Temperature & Pressure Relief Valve 15mm x 1/2'
Altecnic 15mm x 1/2" Temperature & Pressure Relief Valve Safty valve on domestic unvented cylinders, providing relief should the domestic hot water system overheat or overpressure for any reason. Pre-set at 90°C / 7 bar Suitable for most unvented cylinders including Ultrasteel, Tribune HE, RM, Megaflo, ThermaQ cylinders Specification: DZR Brass 15mm x 1/2" connections ...

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£31.76 ex VAT
(£38.11 inc VAT)
Heatrae 11' Gold Dot Immersion + RDT
Heatrae 11' Gold Dot Immersion + RDT
Heatrae 11" Gold Dot Immersion + RDT The Heatrae Sadia Gold Dot immersion heaters are copper sheathed for use in normal water conditions. These 3kW immersion heaters are fitted with an RDT combined thermostat and manually resettable safety cut-out. Gold Dot immersion heaters can also be used in association with an indirect heating coil to provide a boost when faster heat up or quicker heat...
£18.85 ex VAT
(£22.62 inc VAT)

Heatrae 11' Superloy Immersion + RDT
Heatrae 11' Superloy Immersion + RDT
Heatrae 11" Gold Dot Immersion + RDT Superloy is our product range of 3kW immersion heaters which are nickel alloy sheathed to provide high corrosion resistance for use in hard or aggressive water conditions. Our Superloy immersion heaters have a no-heat zone to prevent overheating and they are fitted with an RDT combined thermostat and resettable safety cut-out as standard. Superloy is also...
£19.95 ex VAT
(£23.94 inc VAT)
Heatrae 14' Gold Dot Immersion + RDT
Heatrae 14' Gold Dot Immersion + RDT
Heatrae 14" Gold Dot Immersion + RDT The Heatrae Sadia Gold Dot immersion heaters are copper sheathed for use in normal water conditions. These 3kW immersion heaters are fitted with an RDT combined thermostat and manually resettable safety cut-out. Gold Dot immersion heaters can also be used in association with an indirect heating coil to provide a boost when faster heat up or quicker heat...
£20.95 ex VAT
(£25.14 inc VAT)

Heatrae 27' Gold Dot Immersion + RDT
Heatrae 27' Gold Dot Immersion + RDT
Heatrae 27" Gold Dot Immersion + RDT The Heatrae Sadia Gold Dot immersion heaters are copper sheathed for use in normal water conditions. These 3kW immersion heaters are fitted with an RDT combined thermostat and manually resettable safety cut-out. Gold Dot immersion heaters can also be used in association with an indirect heating coil to provide a boost when faster heat up or quicker heat...
£25.00 ex VAT
(£30.00 inc VAT)
Heatrae 27' Superloy Immersion + RDT
Heatrae 27' Superloy Immersion + RDT
Heatrae 27" Superloy Immersion + RDT Superloy is our product range of 3kW immersion heaters which are nickel alloy sheathed to provide high corrosion resistance for use in hard or aggressive water conditions. Our Superloy immersion heaters have a no-heat zone to prevent overheating and they are fitted with an RDT combined thermostat and resettable safety cut-out as standard. Superloy is also...

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£21.50 ex VAT
(£25.80 inc VAT)

Tesla Copper 11' Immersion Heater & Stat
Tesla Copper 11' Immersion Heater & Stat
Tesla (UK) Copper Immersion Heater & Stat 11" Suitable for soft water areas. Pre-assembled earthing post and cable clamp. Pre-wired thermostat. Sealing washer included. For use with copper cylinders only. Specification Pre-Wired Copper Construction Overheat Cut-Out Protection
£12.50 ex VAT
(£15.00 inc VAT)
Tesla Copper 14' Immersion Heater & Stat
Tesla Copper 14' Immersion Heater & Stat
Tesla (UK) Copper Immersion Heater & Stat 14" Suitable for soft water areas. Pre-assembled earthing post and cable clamp. Pre-wired thermostat. Sealing washer included. For use with copper cylinders only. Specification Pre-Wired Copper Construction Overheat Cut-Out Protection
£14.00 ex VAT
(£16.80 inc VAT)

Tesla Copper 18' Immersion Heater & Stat
Tesla Copper 18' Immersion Heater & Stat
Tesla (UK) Copper Immersion Heater & Stat 18" Suitable for soft water areas. Pre-assembled earthing post and cable clamp. Pre-wired thermostat. Sealing washer included. For use with copper cylinders only. Specification Pre-Wired Copper Construction Overheat Cut-Out Protection
£15.00 ex VAT
(£18.00 inc VAT)
Tesla Copper 23' Immersion Heater & Stat
Tesla Copper 23' Immersion Heater & Stat
Tesla (UK) Copper Immersion Heater & Stat 23" Suitable for soft water areas. Pre-assembled earthing post and cable clamp. Pre-wired thermostat. Sealing washer included. For use with copper cylinders only. Specification Pre-Wired Copper Construction Overheat Cut-Out Protection
£16.00 ex VAT
(£19.20 inc VAT)

Tesla Copper 27' Immersion Heater & Stat
Tesla Copper 27' Immersion Heater & Stat
Tesla (UK) Copper Immersion Heater & Stat 27" Suitable for soft water areas. Pre-assembled earthing post and cable clamp. Pre-wired thermostat. Sealing washer included. For use with copper cylinders only. Specification Pre-Wired Copper Construction Overheat Cut-Out Protection
£16.50 ex VAT
(£19.80 inc VAT)
Tesla Copper 30' Immersion Heater & Stat
Tesla Copper 30' Immersion Heater & Stat
Tesla (UK) Copper Immersion Heater & Stat 30" Suitable for soft water areas. Pre-assembled earthing post and cable clamp. Pre-wired thermostat. Sealing washer included. For use with copper cylinders only. Specification Pre-Wired Copper Construction Overheat Cut-Out Protection
£24.00 ex VAT
(£28.80 inc VAT)

Tesla Copper 36' Immersion Heater & Stat
Tesla Copper 36' Immersion Heater & Stat
Tesla (UK) Copper Immersion Heater & Stat 30" Suitable for soft water areas. Pre-assembled earthing post and cable clamp. Pre-wired thermostat. Sealing washer included. For use with copper cylinders only. Specification Pre-Wired Copper Construction Overheat Cut-Out Protection
£26.00 ex VAT
(£31.20 inc VAT)
Thermowatt 3kW 14' Incoloy Immersion Heater
Thermowatt 3kW 14' Incoloy Immersion Heater
Thermowatt 3kW 14" Incoloy Immersion Heater Element Approved to EN 60335-2-73 and fitted with dual safety thermostat and reset cut-out switch . Suitable for both copper and stainless steel hot water cylinders Specification: Dual safety thermostat 3kW output

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£51.04 ex VAT
(£61.25 inc VAT)

Thermowatt 3kW 14' Smart Immersion Heater
Thermowatt 3kW 14' Smart Immersion Heater
Thermowatt Smart Immersion Heater 3kW 14" Element Smart immersion heaters use up to 20% less electricity than standard immersion heaters by learning the hot water usage profile and automatically optimising the energy input into the cylinder. Approved to EN 60335-2-73 and fitted with dual safety thermostat and reset cut-out switch Specification: Use up to 20% less electricity self-learning...
£83.93 ex VAT
(£100.72 inc VAT)
High Limit Cylinder Thermostat - Codice
High Limit Cylinder Thermostat - Codice
Codice High Limit Thermostat for Hot Water Cylinders High limit thermostat providing safety cut-out, easy to fit onto domestic unvented cylinders. Not suitable for use as a surface mounted thermostat. Specification: 90°C Safety cut-out Bimetallic sensor Use with dry thermostat pocket
£59.00 ex VAT
(£70.80 inc VAT)
FAQs

How Does a Hot Water Cylinder work?

Most hot water cylinders are heated by an external heat source such as a gas boiler or heat pump. The hot water is heated by the heat source and then travels through a copper coil in the hot water tank. The heat is then transferred from the from the external heat source to the water inside the hot water tank which is then connected to a tap or shower outlet.

How do I know if my heating system is a vented or unvented system?

The main differences between a vented and an unvented system is the way the water supply works. With vented or “open” systems, the water supply comes from a cold water tank in the loft. This then uses gravity to carry the water via a “vent pipe” to the hot water cylinder. The cylinder can be copper or stainless steel, and usually lives in an airing cupboard. Because heated water expands, there needs to be somewhere for the expanded hot water to go. In the case of vented systems, the excess water will push back up the vent pipe and back into the tank in the loft.

With unvented systems, the water supply comes directly from the mains water. In the case of unvented systems, when the heated water expands, the expanded water goes into either a separate external expansion vessel (usually installed above the hot water cylinder), or the hot water cylinder itself has an internal expansion vessel. You’ll hear this referred to as a “bubble top” cylinder. As with vented cylinders, the cylinder can be copper or stainless steel, and usually lives in an airing cupboard.

What hot water cylinder do I need for my heating source?

When the only option for the property is to heat the cylinder electrically through an immersion heater, you need to select a “direct” cylinder. When you have a conventional boiler as a heat source, you need to select an “indirect” cylinder. When the property has rentable heat sources available, you need to select either a “solar indirect” or “heat pump” cylinder. Solar indirect cylinders feature two heat exchanger coils, one for connecting to the solar heat source and the other for connecting to a conventional boiler for when insufficient solar energy is available.
When dealing with any unregulated heat source or there are multiple heat sources available, a “thermal store” will usually provide the best solution.

What size hot water cylinder do I need?

For those not familiar with hot water storage, it is important to remember it is usually held at about 60°C, but is intended to be mixed with cold water down to a usable temperature. A bath using 100 litres of hot water at 40°C actually only equates to 60 litres at 60°C. A shower can use 18 litres of hot water per minute at 40°C, which is only 11 litres at 60°C.
The following average consumption levels of hot water (40°C) per person per day can be used as a guide:

  • Low consumption = 20–30 litres
  • Average consumption = 30–50 litres
  • High consumption = 50–70 litres

What if I can’t fit a standard hot water cylinder in my airing cupboard?

With a smaller footprint to height ratio, slimline cylinders can often allow you to get through those narrow loft hatches or fit the cylinder in a tight airing cupboard. However, you will be compromising on the cylinders’ energy efficiency slightly, as tall cylinders such as these lose more heat than shorter fatter cylinders.
Another space-saving solution, a horizontal cylinder allows you to maintain cylinder capacity in situations where height restrictions apply. However, you should be aware horizontal cylinders are marginally less energy efficient with slightly higher heat loss.