Screws DIY accessories

High efficiency condensing boiler with advanced, pre-mixed combustion and electronics. SEDBUK A RatedSystem Boiler OnlySelf DiagnosticRange Rateable OutputHeating Only Boiler * SEDBUK A Rated * System Boiler Only * Self Diagnostic * Range Rateable Output * Heating Only Boiler Screwfix less info

High efficiency condensing boiler with advanced, pre-mixed combustion and electronics. SEDBUK A RatedSystem Boiler OnlySelf DiagnosticRange Rateable OutputHeating Only Boiler * SEDBUK A Rated * Sys... more info

Stainless steel sheathed heating element. BEAB approved. WRAS approved. 2.2kW2.5Ltr CapacityElectronic Thermistor2 Year Manufacturer's Guarantee * 2.2kW * 2.5Ltr Capacity * Electronic Thermistor * 2 Year Manufacturer's Guarantee Screwfix less info

Stainless steel sheathed heating element. BEAB approved. WRAS approved. 2.2kW2.5Ltr CapacityElectronic Thermistor2 Year Manufacturer's Guarantee * 2.2kW * 2.5Ltr Capacity * Electronic Thermistor * ... more info

High efficiency condensing boiler with advanced, pre-mixed combustion. Sealed system compatible with additional equipment. Sedbuk Band A RatedOpen Vent or System BoilerSelf DiagnosticAdvanced Electronics * Sedbuk Band A Rated * Open Vent or System Boiler * Self Diagnostic * Advanced Electronics Screwfix less info

High efficiency condensing boiler with advanced, pre-mixed combustion. Sealed system compatible with additional equipment. Sedbuk Band A RatedOpen Vent or System BoilerSelf DiagnosticAdvanced Elect... more info

Multipurpose treatment to inhibit corrosion, scale, boiler noise and hydrogen gassing in all types of indirect heating systems, including those containing aluminium. Screwfix less info

Multipurpose treatment to inhibit corrosion, scale, boiler noise and hydrogen gassing in all types of indirect heating systems, including those containing aluminium. Screwfix

275ml. A unique, life-long system treatment for the elimination of limescale and boiler noise. Safe to use in all types of indirect central heating systems. Non-acidic. Apply using a caulk gun via bleed valve or filling loop. 1 tube treats a typical domestic heating system. Restores Boiler EfficiencyEliminates KettlingNo Need to Flush - Stays in System * Restores Boiler Efficiency * Eliminates Kettling * No Need to Flush - Stays in System Screwfix less info

275ml. A unique, life-long system treatment for the elimination of limescale and boiler noise. Safe to use in all types of indirect central heating systems. Non-acidic. Apply using a caulk gun via ... more info

Bi-metallic sensor. Surface mounted. Control for boilers and wet central heating. Complies with EN 60730. Conforms to 89/336/EEC and 73/23/EEC. Suitable for Uninsulated / Foam-Lagged CylindersFixing Strap IncludedDouble Insulated * Suitable for Uninsulated / Foam-Lagged Cylinders * Fixing Strap Included * Double Insulated Screwfix less info

Bi-metallic sensor. Surface mounted. Control for boilers and wet central heating. Complies with EN 60730. Conforms to 89/336/EEC and 73/23/EEC. Suitable for Uninsulated / Foam-Lagged CylindersFixin... more info

Rise of 57C alarm trigger. Use in kitchens / boiler rooms. Includes mounting base. EN 54-7. Screwfix less info

Rise of 57C alarm trigger. Use in kitchens / boiler rooms. Includes mounting base. EN 54-7. Screwfix

Baxi Flue Vertical Terminal Adaptor for use with Baxi Boilers. OD 100-125mm. All Gas Products must be Installed by a Gas Safe Registered Installer * All Gas Products must be Installed by a Gas Safe Registered Installer Screwfix less info

Baxi Flue Vertical Terminal Adaptor for use with Baxi Boilers. OD 100-125mm. All Gas Products must be Installed by a Gas Safe Registered Installer * All Gas Products must be Installed by a Gas Safe... more info

Push straight onto copper tube (use Pipe Inserts for plastic pipe). Removable and re-usable. Water Research Council Approved. British Gas Service Approved for water pipes. No tools needed. BS 7291/PT1/PT3. Use 1m of copper pipe when coupling to a boiler. Speedfit is updating some fittings, so certain items received may vary in appearance to those pictured, but are of equal or better quality. Screwfix less info

Push straight onto copper tube (use Pipe Inserts for plastic pipe). Removable and re-usable. Water Research Council Approved. British Gas Service Approved for water pipes. No tools needed. BS 7291/... more info

1Ltr. General purpose treatment for total protection against scale and corrosion. For use in all types of indirect central heating systems, including those containing aluminium. Non-acidic. Ensures Optimum Boiler EfficiencyPrevents Pin-HolingNon-Staining, Colourless Formulation * Ensures Optimum Boiler Efficiency * Prevents Pin-Holing * Non-Staining, Colourless Formulation Screwfix less info

1Ltr. General purpose treatment for total protection against scale and corrosion. For use in all types of indirect central heating systems, including those containing aluminium. Non-acidic. Ensures... more info

Push straight onto copper tube (use Pipe Inserts for plastic pipe). Removable and re-usable. Water Research Council Approved. British Gas Service Approved for water pipes. No tools needed. BS 7291/PT1/PT3. Use 1m of copper pipe when coupling to a boiler. Speedfit is updating some fittings, so certain items received may vary in appearance to those pictured, but are of equal or better quality. Screwfix less info

Push straight onto copper tube (use Pipe Inserts for plastic pipe). Removable and re-usable. Water Research Council Approved. British Gas Service Approved for water pipes. No tools needed. BS 7291/... more info

1Ltr. A unique, life-long system treatment for the elimination of limescale and boiler noise. Reduces fuel usage. Safe to use in all types of indirect central heating systems. Non-acidic. Restores Boiler EfficiencyEliminates KettlingNo Need to Flush - Stays in System * Restores Boiler Efficiency * Eliminates Kettling * No Need to Flush - Stays in System Screwfix less info

1Ltr. A unique, life-long system treatment for the elimination of limescale and boiler noise. Reduces fuel usage. Safe to use in all types of indirect central heating systems. Non-acidic. Restores ... more info

Provides long term protection of domestic central heating systems against internal corrosion and limescale formation. Prevents corrosion of all metals. Use on all types of boilers, radiators and pipework systems. Easily applied via radiator with patented applicator. Stops Frequent Venting of RadiatorsPrevents Bacterial Contamination10 Year Manufacturer's Guarantee * Stops Frequent Venting of Radiators * Prevents Bacterial Contamination * 10 Year Manufacturer's Guarantee Screwfix less info

Provides long term protection of domestic central heating systems against internal corrosion and limescale formation. Prevents corrosion of all metals. Use on all types of boilers, radiators and pi... more info

Fixed temperature 90C. Use in kitchens / boiler rooms. Includes mounting base. EN 54-7. Screwfix less info

Fixed temperature 90C. Use in kitchens / boiler rooms. Includes mounting base. EN 54-7. Screwfix

2kg. Use around fire bricks, flues and boilers. Heat-resistant to 1250C. Screwfix less info

2kg. Use around fire bricks, flues and boilers. Heat-resistant to 1250C. Screwfix

5Ltr. Effective frost protection. Also controls corrosion, scale, boiler noise and hydrogen formation in all types of indirect heating systems, including those containing aluminium components. Screwfix less info

5Ltr. Effective frost protection. Also controls corrosion, scale, boiler noise and hydrogen formation in all types of indirect heating systems, including those containing aluminium components. Scre... more info

British Gas approved. WRAS approved. SEDBUK A RatedStainless Steel Heat ExchangerTop Outlet Fluing2 Year Manufacturer's GuaranteeEnergy Saving Trust ApprovedFlow Rate 14 Ltr/minMax Output 32kWBTU Output 109000Nox Emissions: 37Frost Protection * SEDBUK A Rated * Stainless Steel Heat Exchanger * Top Outlet Fluing * 2 Year Manufacturer's Guarantee * Energy Saving Trust Approved * Flow Rate 14 Ltr/min * Max Output 32kW * BTU Output 109000 * Nox Emissions: 37 * Frost Protection Screwfix less info

British Gas approved. WRAS approved. SEDBUK A RatedStainless Steel Heat ExchangerTop Outlet Fluing2 Year Manufacturer's GuaranteeEnergy Saving Trust ApprovedFlow Rate 14 Ltr/minMax Output 32kWBTU O... more info

Calls for back-up heating from boiler when solar power is not available. Prevents collector and store from over heating and monitors the complete solar thermal installation. Suitable for typical UK solar thermal systems. 3-Button OperationBacklit Display with Pictograms * 3-Button Operation * Backlit Display with Pictograms Screwfix less info

Calls for back-up heating from boiler when solar power is not available. Prevents collector and store from over heating and monitors the complete solar thermal installation. Suitable for typical UK... more info

Provides protection for both pump and boiler. Meets building regulation requirements. Screwfix less info

Provides protection for both pump and boiler. Meets building regulation requirements. Screwfix

Differential pressure bypass valve for heating systems where TRVs are installed. Maintains high return water temperature to inhibit rust. Maintains Optimum Flow RateReduces Noise & VibrationMaximises Boiler Efficiency * Maintains Optimum Flow Rate * Reduces Noise & Vibration * Maximises Boiler Efficiency Screwfix less info

Differential pressure bypass valve for heating systems where TRVs are installed. Maintains high return water temperature to inhibit rust. Maintains Optimum Flow RateReduces Noise & VibrationMax... more info