Please note: We are currently undertaking a stock take. All orders placed on Tuesday 30th and Wednesday 1st will be dispatched on Thursday 2nd October. We apologise for any inconvenience caused.

Electric Shower FAQs

VERY IMPORTANT:  Please remember to switch off (isolate) electrical and water supplies BEFORE proceeding with the installation or carrying out servicing of electric showers.

Please note: These FAQs are not applicable for our new GSX electric shower range. If you have purchased a GSX electric shower and require assistance, please refer to the troubleshooting guide within the User Instructions.

Alternatively, please contact our technical helpdesk by calling 01959 560760 between 8.30 - 17.00 Monday to Friday or send us an email.

Important Links:

Shower Parts Store
Help Me Choose A Shower
Electric Shower Range
Replace an Old Shower Model

Electric Shower FAQs:

I have a lower flow rate on hot than on cold

This is perfectly normal. Electric showers produce a greater heat by reducing the flow rate of water over the heater. By increasing the heat you are reducing the flow.

My shower will not turn off

Please check the following:

  1. Ensure that the front cover is fitted correctly. If the wires to the power connections are pushing against the inside of the case, the cover will be out of line and the on/off switch will jam.
  2. Ensure that the main engine of the unit is not twisted. This can occur if the tiling is not flat. If it is not square, release the tension on the securing screws until the unit is flat. Spacers are supplied with the unit to assist in installing the unit squarely.

My shower runs on after it is turned off

Our electric showers incorporate a 'phased shutdown'. This flushes the heat exchanger with cold water once the power is off to prevent a hot water surge if the unit is turned on again quickly. This shutdown can take up to 10 seconds dependent on the water pressure.

My shower fluctuates between very hot and very cold

The shower incorporates an Over Temperature Protection safety device that protects the bather. If the flow of water through the heater is too low and the water gets too hot this device will cut out the heater elements. The hot water will then be flushed out and the element reconnected. If there is still insufficient water flow the unit will overheat again and the cycle will continue.

Try the following steps:

  1. Increase the water flow by turning the water control knob in the cold temperature direction.
  2. Ensure the shower head and spray plate are clean and free of limescale.
  3. Are the original shower head and hose being used? The shower will only function correctly with the hose and head provided. Find the correct head and hose in our online parts store.
  4. Are other water outlets in use? The temperature will fluctuate if other water outlets in the premises are being used or if there is fluctuating mains water pressure. 

Water runs from around the hose of my shower

There are 2 possible causes of water leaking around the hose:

  1. Hose connections – Check to ensure that the hose connection is tightened and that the sealing washers are fitted correctly and not damaged.
  2. The PRD has activated - To meet European Standards, the shower unit features an integral PRD. The PRD provides a degree of shower unit protection should an excessive build up of pressure occur within the shower. This would normally be due to a kinked or damaged hose or a blocked shower head. If the PRD has activated then it will need to be replaced. These can be purchased direct from our online Parts Store or by contacting our customer services team.

My shower is too hot

There are a number of possible causes. Take the following steps to try to eliminate the problem:

  1. Ensure that the stop cock and servicing valves are fully open.
  2. Is the water flow too low? Increase the flow by turning the water control knob towards the cold temperature setting. 
  3. Check that the handset and hose are clear of debris or lime scale.
  4. Head and hose: The shower will only function correctly with the hose and handset provided.
  5. Check for a filter blockage. For advice on debris in the filter, please refer to the installation and user guide or contact customer services. Additional installation guides can be downloaded from our website.

My shower runs cold

There are a number of possible causes. Try the following steps to solve the problem:

  1. Check the power supply to the unit; is the isolator switch turned on? Are there any tripped switches or blown fuses?
  2. Check if the water flow is too high. Reduce the flow by turning the water control knob towards the hot temperature markings (clockwise) slowly. 
  3. Head and hose: The shower will only function correctly with the hose and handset provided. Buy the correct shower head and hose for your shower.
  4. Is there sufficient water pressure? The minimum working pressure required is approximately 1 bar at 8 litres per minute. If you have enough pressure the small white plunger between the black heater unit and the electrical connectors will drop down.

My shower has a very low or no flow

There are a number of possible causes of no or low flow, follow the following steps to try to find the cause of the problem:

  1. Check the power supply to unit.
  2. Ensure the water supply to the shower is turned on and the isolation valve is fully opened.
  3. Check if the water control is turned fully clockwise. Turn the flow control knob anticlockwise to increase water flow.
  4. Check if there is an outlet blockage:
    1. - Disconnect the handset from the hose and run the shower. If water flows, then the handset is blocked.
      - If there is no flow, remove the hose from the outlet. If water flows the hose is blocked.
      - If there is still no flow there is a possible restriction in the supply to the shower or debris in the filter. For advice on debris in the filter, please refer to the installation and user guide  or contact customer services.

My shower is leaking from the bottom of the unit

If the leak occurs when the shower is turned on then this will be due to the PRESSURE RELIEF DEVICE (PRD) activating.

To meet European Standards, the shower unit features an integral PRD. The PRD provides a degree of shower unit protection should an excessive build up of pressure occur within the shower. This would normally be due to a kinked or damaged hose or blocked shower head. You can buy a replacement shower head or hose in our online parts store.

The shower will only function correctly with the hose and handset provided. Failure to do so may result in the operation of the PRD.

If the PRD has activated then it will need to be replaced. These can be purchased directly from us; please visit our online Parts Store or contact Customer Services.

I have an older Gainsborough electric shower. Are the new showers a direct replacement for my shower?

It depends which model shower you wish to replace. For advice please take a look at our online replacement shower guide or call our customer services team on 01959 560760 with the model and dimensions of your current shower and we will be able to advise you on the best replacement shower.

Do Gainsborough Showers manufacture an electric shower that can be fed from a cold water storage cistern?

At present our electric showers are only suitable for mains fed systems.

What size supply fuse is should I use?

The minimum fuse size required for each kilowatt rating is listed below. This is based on a 240V electrical supply.
 
8.5kW - 40 Amp supply fuse
 
9.5kW - 40 Amp supply fuse
 
10.5kW - 45/50 Amp supply fuse

What size electric cable is required?

We are unable to confirm the required cable size for any of our electric showers and the chart below is provided as a guide only.  Part P of Schedule 1 to the Building Regulations which was introduced in February 2005 states that information of this nature can only be given by a qualified electrician certified competent for undertaking installation work. As such a Part P registered electrician will need to visit site and investigate the matter as the electrical installation must comply with British Standard 7671.

Where is the water inlet and wiring connection on the shower?

All electric showers in the Gainsborough range have the water inlet and wiring connections on the right hand side.

What is the minimum water pressure and flow rate required for Electric Showers?

The minimum water pressure is 0.9 bar working pressure and minimum flow required is 8 litres per minute.

Why choose an electric shower with a high kilowatt rating?

Electric showers with a higher kilowatt rating allow for a greater flow rate of water giving you a more powerful shower. Electric showers heat cold water on demand by passing it over a heating element similar to that in a kettle. To increase the temperature, the flow rate is restricted so the water is heated for longer but this also means the flow rate of the shower is less.

An electric shower with a higher kilowatt rating is able to heat the water to the same temperature more quickly and so will not have to restrict the flow rate of water as much, providing a more powerful shower.

View our range of 10.5 kW showers.

How does an electric shower work?

An electric shower takes water directly from the mains cold water supply rather than using your household hot water system. When you turn the shower on, the water is heated by passing over a heating element, similar to that in a kettle. The temperature of the water is adjusted by restricting and increasing the rate of water flow over the heating element. Restricting the water flow means the water is heated for longer, and so reaches a higher temperature.

Electric showers are ideal for large households or if there is a limited supply of hot water available. As water is heated on demand they are ready to use at the touch of a button whenever required.

View our range of electric showers.