Install Guide
By UK Radiator Market
Installing a radiator correctly is essential for efficient heating, safety, and long-term performance. Whether you’re upgrading to a modern designer radiator or replacing an older model, this guide will walk you through the key steps and considerations for installing a radiator in your UK home.
Before You Begin
Tools & Materials You’ll Need
Adjustable spanner or wrench
Pipe cutter or hacksaw
PTFE tape (for sealing joints)
Radiator valves (manual or thermostatic)
Wall brackets and fixings (usually supplied)
Radiator key (for bleeding)
Spirit level
Bucket or towels (for draining water)
Safety First
Turn off your central heating system and allow it to cool completely.
Shut off the water supply before removing or installing any radiator.
If unsure, consult a Gas Safe registered engineer or qualified plumber.
Step 1: Choose the Right Radiator
At UK Radiator Market, we offer a wide range of radiators — from compact convectors to stylish vertical and designer models.
Make sure your new radiator matches:
The BTU requirement of the room (use our BTU Calculator online).
The pipe centres and wall space available.
Your decor style and heat output needs.
Step 2: Drain the Central Heating System
Turn off your boiler and power supply.
Locate the drain-off valve, usually at the lowest point of your heating system.
Attach a hose and open the valve to drain the water into a bucket or outside drain.
Open the bleed valves on your radiators to help the water flow out faster.
Step 3: Remove the Old Radiator
Place towels under the radiator valves.
Loosen the nuts connecting the radiator to the valves.
Carefully lift the radiator off the wall brackets (it may still contain water).
Plug or cover the open pipe ends to prevent drips.
Step 4: Fit the New Brackets
Measure and mark the bracket positions using your new radiator as a guide.
Use a spirit level to ensure alignment.
Drill holes and fix the brackets securely to the wall with appropriate plugs and screws.
Double-check the spacing between the valve connections and pipe centres.
Step 5: Install the New Radiator
Lift the radiator onto the wall brackets.
Wrap PTFE tape around the valve threads to ensure a tight seal.
Connect the valves to the radiator and tighten with a wrench (do not overtighten).
Ensure all joints are secure and correctly aligned.
Step 6: Refill & Bleed the System
Close the drain valve and refill the system via your boiler’s filling loop.
Open the bleed valve on the radiator using a radiator key until water appears (to remove trapped air).
Check all connections for leaks.
Turn on the heating and ensure the radiator warms up evenly.
Step 7: Final Checks
Check for any signs of leaks or uneven heating.
Re-bleed if necessary after 24 hours.
For thermostatic radiator valves (TRVs), ensure they are functioning correctly.
Pro Tips from UK Radiator Market
Always check your boiler pressure after installation (ideal range: 1.0–1.5 bar).
If installing multiple radiators or converting to a pressurised system, hire a qualified installer.
Consider adding radiator inhibitor fluid to prevent corrosion.
Summery Checklist
| Step | Task | Done |
|---|---|---|
| 1 | Turn off heating & water | ☐ |
| 2 | Drain system | ☐ |
| 3 | Remove old radiator | ☐ |
| 4 | Fit new brackets | ☐ |
| 5 | Connect new radiator | ☐ |
| 6 | Refill & bleed | ☐ |
| 7 | Check for leaks | ☐ |