Boiler / Gas Fire Parts
Boiler Parts

Air Pressure Switches
Air Pressure Switches for the most common boilers. An air pressure switch i..
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Auto Air Vents
Auto air vents are used in heating sytems to automatically release air in t..
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Clocks
Built in boiler clocks both digital and mechanical. Built in clocks are mou..
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Condensate Components
Condensate components used in condensing boilers..
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Control Knobs
Control Knobs for boilers and gas fires..
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Diaphragms
Diaphragms for diverter valves and hydraulics. Diaphragms are used in the h..
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Diverter Valves / Glands
A diverter valve is usually found in combi boilers. It allows for the water..
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Electrical Parts
Electrical parts used in boilers, ror example: transformers, coils, wiring ..
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Electrodes
Electrodes are used in boilers, gas fire and other gas appliance. There are..
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Expansion Vessels
An expansion vessel is a tank used in heating systems and in boilers. It's ..
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Fans
Most modern boilers incorporate a fan to expel the exhaust products of comb..
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Filling Loops
A filling loop is used to pressurise a sealed heating system. Some of the n..
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Flow Switches
A flow switch, also reffered to as a flow sensor or flow turbine is used to..
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Fuses
Fuses are safety devices used to protect against the flow of excessive curr..
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Gas Valves
Multifunctional gas valves for boilers and other gas appliances..
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Gauges - Tempertature / Pressure
Pressure and temperature gauges for measurement. Found in boilers and on ce..
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Heat Exchangers
Primary and secondary heat exchangers for gas boilers. Primary or main heat..
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Isolation Valves
Isolation Valves for boilers..
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Low Water Sensors
Low water pressure sensors / switches as the name suggests are used to tell..
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Piezo Ignitor/Spark Generator
Piezo Ignitors / spark generators are used to provide a very high voltage t..
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Printed Circuit Boards
Printed Circuit Boards or PCBs are the main control center of the boiler. I..
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Pumps
Pumps or circulators are used to pump the water around the central heating ..
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Repair Kits
Repair kits for diverter valves and hydraulic blocks in central heating boi..
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Safety Valves
Safety Valves or pressure relief valves for boilers and central heating sys..
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Thermisters
Thermisters are temperature sensors also known as NTC or PTC probes. They a..
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Thermocouples
Thermocouples for central heating boilers. A thermocouple is used to detect..
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Thermostats
Thermostats used in boilers to control the boiler or detect overheating. Co..
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Washers and Gaskets
We hold a range of the most popular fibre and rubber washers for most heati..
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Misc Spares
miscellaneous boiler parts..
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Manufacturers
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Ferroli

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Halstead

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Remeha

Saunier Duval

Sime

Thorn

Vaillant

Viessmann

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Worcester
Tools & Consumables
Tools

Cutting Wheels
Pipe clice cutting wheels..
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Electrical
Electricians Tools..
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Hand Tools
Here we have a selcection of hand tools including screwdrivers, pliers,hamm..
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Nerrad Tools
Nerrad Tools..
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Packs
Tool packs..
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Pliers
Pliers and wrenches used plumbers..
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Plumbing
Plumbing Tools..
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Power Tool Accessories
Power tool accessories such as drill bits, screwdriver bits and jigsaw blad..
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Power Tools
Power Tools..
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Screwdrivers
Handy screwdrivers for the gas engineer. Stubby, long reach, flat,pozdrive ..
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Torches and Lamps
Led Torches and lamps to help you see the light...
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Tube Cutters
Copper and plastic tube cutters..
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Protection
Protection and safety products for plumbers and gas engineers..
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Electrical Testers
Electrical testers, multimeters and other testing equipment..
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Consumables

Aerosols
Aerosols used by gas engineers. Gas leak sprays, Air dusters..
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Lubricants
Lubricants such as silicone grease and gas cock grease..
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Report Pads
Report pads and labels used by gas engineers..
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Smoke Products
Smoke products such as smoke pellets and smoke matches..
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Heating & Plumbing

Filters
Central heating filters to protect your heating system and boiler component..
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Chemicals
Central heating chemicals to remove sludge and contaminants from your centr..
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Brassware
Brassware such as automaic bypass valves, pressure reducing valves, TRVs..
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Controls

Built in boiler clocks
Built in boiler clocks both digital and mechanical. Built in clocks are mou..
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External Timers / Programmers
External programmers and timers both digital and mechanical. External progr..
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Room Thermostats
Room thermostats for controlling the temperature in the house. Room thermos..
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Smoke / Co Alarms
Smoke alarms and carbon monoxide alarms for the protection of your property..
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Motorised Valves
Motorised valve for controlling the flow of water in central heating system..
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Manufacturer: Halstead Product Code: HAEV0999

Halstead Expansion Vessel 450999

Product Information:An expansion tank or expansion vessel is a small tank used to protect closed (not open to atmospheric pressure) water heating systems and domestic hot water systems from excessive pressure. The tank is partially filled with air, whose compressibility cushions shock caused by w..

£115.99

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