Top-up the towel rail by removing one of the top plugs and fill it with water only allowing around 10% of the height for expansion when the water gets hot. Liquid filled Electric Towel Rails have a heating element fitted into one of the vertical collectors that heats up the liquid inside the rail. They are in principle similar to a kettle; however, the larger volume and the requirement for a safer surface temperature does not allow changes in temperature to be immediately spread across the rail.

Every single electrical appliance is a source of residual current that normally flows from the Earth connection. If the RCD is already charged close to its tripping value (30mA), It will trip when the additional residual current is added, exceeding the tripping value. To detect this, the residual current before plugging-in the appliance should be measured to see how this is close to the limit value of the RCD.

What's inside the box ?

The RCD should be 30mA maximum and should be of good quality. There are many low cost & low quality ones in the market, which can cause problems without any reason The RCD can trip when the Earth circuit of the building is not good enough. There is always a difference of potential difference (residual current) between Neutral and Earth coming from the Earth. This value increases with humidity and many other reasons. If the Earth connection is not good enough this will be added to the residual current generated by the electrical appliance and will often trip the RCD. Cut the cable to the desired length and strip the outer sleeve for approximately 40mm. Cut the coloured wires to the correct lengths and strip off approximately 5mm of the insulation on each one. When an electrical element is used to heat a liquid filled towel rail or radiator you will not get identical performance as you would with it connected to a central heating system. There is no circulation; therefore, it will take longer to heat up and will be noticeably hotter nearer the element. See heat distribution... The controller allows you to incrementally adjust the surface temperature of your towel rail so you can minimise energy use during warmer weather and also includes an additional 2-hour timer function. Once selected, the timer function sets the towel rail to run at a higher temperature for the first 30 minutes, then reverts to a lower setting for the final 90. Using this feature, you can leave your towel rail to run for a restricted period, without worrying about having to switch it off afterwards.

After a few hours continuous use the heat would have spread but there will still be temperature variances across the surface but this is not a fault. If you are refilling a towel warmer from empty then a combination of 85% water and 15% corrosion inhibitor is recommended. Standard Electric Towel Rails should be turned on for at least 4 hours to reach their peak temperature.

Low surface temperature (LST) towel rails should be fitted in certain buildings, used by children, the elderly or any other vulnerable people. This includes schools, nurseries, healthcare premises, homes for the elderly and most publicly accessible buildings. Complies with NHS Estates Health Guidance Notes on Safe Hot Water & Surface Temperature

The electrical element senses the internal water temperature and this can be adjusted up and down. This gives you surface temperature control. The thermostatic element also features a 2 hour button which can either change the temperature for 2 hours or turn off after 2 hours. They also incorporate a thermal fuse as a safety feature. Improve the versatility of your bathroom heating with the Wall Mounted Towel Rail Controller. This handy accessory is compatible with manual electric towel rails and provides them with extra energy-saving features so you can slim down your heating bills and enjoy more responsive warmth in the process.