How to turn on & adjust temperatures on heated towel rails

A warm towel after a shower isn’t just a luxury, it’s one of life’s small, daily pleasures. Whether your towel rail is part of your central heating system, powered by electricity, or dual fuel (a mix of both), how you control it makes a huge difference to your comfort and energy efficiency.

In this guide, we’ll walk you through exactly how to turn on, adjust, and get the most from your heated towel rail, no matter what type you have.

Table of Contents

1. Central heating towel rails
2. Electric towel rails
3. Dual-fuel towel rails
4. Cost and efficiency
5. Frequently-asked questions
6. Heated towel rails at TradeRadiators.com

Central heating towel rails

If your heated towel rail is connected to your central heating system, it works in the same way as your radiators. When your boiler fires up, hot water flows through the copper pipework and into the towel rail. As the water circulates, the rail heats up and gently emits warmth into the room.

In most cases, this happens automatically whenever your central heating is on, depending on how you’ve set your thermostat and timer.

How to control your temperature

Because these rails are connected to your boiler, you can’t set their temperature independently in the same way as you can with an electric towel rail. Instead, their heat output depends on, the temperature set on your central thermostat, the boiler flow temperature (typically between 60°C–70°C) and the BTU rating (heat output capacity) of the towel rail itself. In other words, when your heating system is on, the rail heats up and when it’s off, so is your rail.

Understanding Thermostatic Radiator Valves (TRVs)

A thermostatic radiator valve gives you some extra control. It doesn’t switch the towel rail on or off directly, but instead, it regulates how much hot water enters the rail based on the temperature in the room.

If the bathroom reaches your preferred temperature, the TRV will automatically reduce or stop the flow of hot water to the rail, helping save energy while keeping things comfortable.

Most TRVs have a dial with settings from 0 (or frost protection) up to 5.
Here’s a rough guide:

• 0 – Off or frost protection (prevents freezing but provides no heat).
• 1–2 – Low heat, ideal for mild weather or background warmth.
• 3 – Comfortable average room temperature (around 20°C).
• 4–5 – High heat, for very cold days or large bathrooms.

In winter, settings between 2 and 3 are usually ideal, providing a steady and comfortable temperature without wasting energy.

• Further reading: What do the Numbers on a Thermostatic Radiator Valve Mean?

Does the radiator feel cold at the top?

If the top section of your towel rail feels cold while the bottom is hot, it likely needs bleeding. This simply means releasing trapped air inside the rail that stops hot water from circulating properly.

To fix it:

1. Turn off your heating and let the rail cool.
2. Use a radiator key to slowly turn the bleed valve at the top corner of the rail.
3. When air hisses out, wait until water starts to flow, then close the valve.
4. Your towel rail should now heat evenly again.

• Further reading: Bleeding a Radiator - The Complete Guide

Electric towel rails

Electric towel rails work entirely independently from your central heating system. They’re wired into your home’s electrical circuit and contain a heating element that warms the liquid inside the rail.

This means you can use them year-round, even when your main heating is off which perfect for drying towels in summer without heating the whole house. 

Types of electric element

There are two main types of electric elements, but modern technology has made the second type far more popular:

Fixed temperature (non-thermostatic)

These heat to a single temperature (typically around 60°C) and simply switch on and off at the wall or fused spur. They’re reliable, low-cost, and great if you just want simple warmth for towels.

Thermostatic or digital elements

These give you precise control over temperature and timing. You can adjust the rail between roughly 40°C and 70°C, depending on how warm you want it.

Modern features you might have

Today’s thermostatic elements often come with advanced features designed for convenience and efficiency:

• Digital displays which clearly show your chosen temperature and settings.
• 24-hour timers allowing you to program your rail to come on automatically in the morning or evening.
• Boost mode which provides a quick burst of heat (usually 1–2 hours) to dry towels fast.
• Open window detection which temporarily pauses heating if the temperature suddenly drops (saving electricity).
•  App control which is available on some premium models for total flexibility.

Most controls are located at the bottom of the towel rail on the element itself, though some models use a smartphone app nd occasionally a remote control.

• Further reading: A Complete Guide to Electric Heating

Dual-fuel towel rails

A dual fuel towel rail combines the benefits of both systems. It’s connected to your central heating and fitted with an electric element, so you can switch between the two depending on the season.

This setup gives you incredible flexibility. In winter mode, the rail heats up with your central heating, just like a standard plumbed-in rail. In summer mode, you can switch your heating off, close the TRV, and turn on the electric element instead. The rail runs independently from the main system. This is ideal when you only need to dry towels or add gentle warmth on warmer days without firing up the boiler.

How to switch between modes

Most dual fuel towel rails have both a TRV and a heating element fitted on opposite sides at the bottom.

To use summer (electric) mode:

• Ensure your central heating is off.
• Turn the TRV down to 0 (or fully off).
• Turn on the electric element using the fused spur switch or control panel.

For winter (central heating) mode:

• Turn off the electric element.
• Turn the TRV to your preferred setting (around 2–3).
• The towel rail will now heat up whenever your heating system is running.

In both modes, you'll be maximising efficiency and only using the towel rail exactly when you need it.

• Further reading: What is Dual Fuel Heating and How Does it Work?

Cost and efficiency

When deciding how to use or upgrade your towel rail, cost and efficiency are worth understanding.

• Central heating towel rails 
  Generally cheaper to run when your boiler is already operating, as they use the same water flow as your radiators. However, they can’t be used on their own without the rest of the system running.
• Electric towel rails
  Use more expensive electricity per unit of energy but are highly efficient because all the power they consume turns directly into heat. They’re ideal for quick, targeted use.
• Dual fuel rails
  Give you the best of both worlds being efficient in winter, and flexible and independent in summer.

If you’re switching from one system to another, keep in mind that rewiring or re-plumbing might be required, so it’s best to get advice from a qualified installer.

• Further reading: How Much Does it Cost to Install a Heated Towel Rail?

Frequently-asked questions

Heated towel rails at TradeRadiators.com

If you’re thinking about upgrading your towel rail, you’ll find that today’s models are far more efficient, stylish and versatile than ever before. From sleek, chrome designs that complement contemporary bathrooms to traditional column-style towel rails that add character and warmth, there’s something to suit every taste and layout.

At Trade Radiators, you can explore one of the UK’s largest online collections of heated towel rails including central heating, electric, and dual fuel models in a huge variety of sizes, finishes, and outputs. Whether you want a minimalist look in matt black or the classic charm of super clean white, every rail is designed for reliability and performance.

Better still, delivery is free to most UK mainland addresses, and every product comes backed by extensive guarantees for your peace of mind. With clear BTU and wattage details listed on every product page, it’s easy to find the perfect towel rail for your bathroom size and heating setup.

If you’re unsure which model to go for, Trade Radiators’ expert support team can help you choose the right type, element, or accessories to make installation simple and efficient. It’s the easiest way to modernise your bathroom and enjoy warm, dry towels all year round.