How to Measure a Towel Radiator Correctly: A Complete Guide

A towel radiator does more than warm towels — it plays an important role in how comfortable and functional your bathroom feels. Choosing the right size is essential, as even small measuring mistakes can lead to fitting problems, unnecessary plumbing changes, or insufficient heat. This guide explains exactly how to measure for a towel radiator, helping you achieve a clean installation and reliable performance.

Measure a Towel Radiator

Why Accurate Measurements Matter

Careful measuring is the foundation of a successful radiator installation. If you are replacing an existing unit, matching key dimensions allows the new towel radiator to connect smoothly to your current pipework. For new installations, accurate measurements ensure the radiator fits the chosen wall space without interfering with doors, furniture, or other bathroom fittings.

Correct measurements also make it easier to select a radiator with the right heat output. Understanding your available space and room size helps you choose a towel radiator that delivers enough warmth to heat the bathroom effectively.

Tools You Will Need

Before you begin measuring, gather the following items:

A reliable tape measure
Pen and paper or a notes app to record dimensions
A spirit level to check alignment (optional but useful)
A smartphone or camera to photograph existing pipework and fittings

Having these tools ready will help you avoid errors and keep your measurements organised.

Step-by-Step Guide to Measuring a Towel Radiator

Step 1: Measure the Available Height and Width

Start by measuring the wall area where the towel radiator will be installed.

Measure the total height from top to bottom of the available space
Measure the width from left to right, ensuring there is enough clearance on both sides
If you are replacing an old radiator, note the height and width of the existing unit and confirm the new radiator will cover any visible marks
For tight and narrow space we have 200mm wide black towel radiator and 200mm wide chrome towel radiator

Step 2: Measure the Pipe Centres

Pipe centres refer to the distance between the centre points of the two water inlets on the radiator.

This measurement is particularly important when replacing an existing towel radiator
Measure directly between the centres of the two pipe connections
Matching this measurement reduces the need to alter pipework during installation

Step 3: Check the Projection from the Wall

The projection shows how far the towel radiator extends into the room.

Measure from the wall to the furthest point of the radiator
In smaller bathrooms, this ensures there is enough space to move comfortably
Also measure the distance from the wall to the centre of the pipe inlets, often referred to as the wall-to-pipe-centre measurement

Step 4: Allow Space for Radiator Valves

Radiator dimensions usually do not include valves, so this extra space must be considered separately.

Valves can add up to 75–80mm on each side
This means the total width may increase by as much as 150–160mm
Choosing the correct valve type is also important:
- Angled valves suit pipework coming from the wall
- Straight valves are used when pipes rise from the floor

Step 5: Calculate the Required Heat Output (BTU)

To keep your bathroom warm, your towel radiator must provide sufficient heat output.

Measure the room’s length, width, and height
Take note of windows and external walls
Use an online BTU calculator to determine the recommended heat output

Selecting a towel radiator with the correct BTU rating ensures both the room and your towels warm efficiently.

Replacing an Existing Radiator vs Installing a New One

Replacing a radiator:
Focus on matching the pipe centres, while also confirming the height and width are suitable. This approach makes installation quicker and helps avoid visible gaps or marks.

Installing a new radiator:
You have more flexibility with placement. Choose the most practical wall location, confirm the available space, calculate the required BTUs, and plan pipework accordingly.

Frequently Asked Questions

What are pipe centres on a towel radiator?

Pipe centres are the distance between the centre points of the two pipe connections on the radiator.

Do radiator measurements include valves?

No. Valve dimensions are usually not included and must be added separately.

How much extra space do radiator valves require?

Allow approximately 75–80mm per valve, or around 150–160mm in total.

What does radiator projection mean?

Projection is the distance the radiator extends from the wall once installed.

How do I measure wall-to-pipe centres?

Measure from the wall surface to the centre point of the pipe inlets.

How do I choose the right size towel radiator?

Measure the available wall space and use a BTU calculator to determine the required heat output.

Can I install a towel radiator myself?

If you have plumbing experience, a direct replacement may be possible. For new installations or complex setups, a qualified plumber is recommended.

Where is the best place to install a towel radiator?

An interior wall, away from drafts and close to where towels are used, is usually the most effective location.

Final Thoughts

Accurately measuring for a towel radiator ensures a smooth installation, efficient heating, and a polished finish. By following this guide, you can confidently select a towel radiator that fits your bathroom layout, meets your heating needs, and enhances both comfort and style.

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