As with any instantaneous water heater – like combination boilers or gas water heaters – the performance of an electric shower is directly affected by the incoming water supply conditions.
As the seasons change, the temperature of the incoming cold mains water supply will inevitably fluctuate – it'll be warmer in summer months and cooler in winter months. If you’ve noticed that your electric shower is too hot or too cold, this could be why. Read on to find out more about how seasonal weather affects your shower and how you can alter the settings to ensure you have the perfect shower temperature year-round. We’ll focus mainly on electric showers, but keep reading for information on mixer and power showers too.
How electric showers work
An electric shower is very similar to an electric kettle: heating elements, located in the shower heater tank, heat the cold mains water supply as it passes through the shower.
Unlike a kettle, the water supply to a shower is constantly flowing, so to set a comfortable showering temperature, a balance needs to be established between the power applied to heat the water and the speed at which the water flows through the shower.
How to adjust your electric shower
Most Mira showers have 3 power settings:
- Low – the heating elements are switched off, so your shower delivers a completely cold flow of water (the same temperature of the incoming cold mains water supply).
- Medium or Eco – only one heating element is used. This is useful for those looking to limit their power and water consumption. This setting is only likely to heat the water to a comfortable showering temperature during the summer months.
- High – both heating elements are switched on using the full power capacity of the shower. This will deliver a warm shower regardless of the season.
The temperature delivered by the shower is then adjusted using the temperature dial, which alters the flow rate of the cold mains water passing through the shower. The slower the flow rate, the warmer the shower, because the water has more time to heat as it passes over the elements. The faster the flow rate, the cooler the shower, because the water has less time to heat as it passes over the elements.
What to do if your electric shower is too hot in summer
During the summer months, the temperature of the incoming cold mains water supply can be warmer than average. During this time, the temperature of your shower may increase and even become too hot.
To set to a more comfortable showering temperature, turn the temperature dial anti-clockwise. This will increase the flow rate through the shower and therefore reduce the showering temperature.
If you’re looking to reduce power and water consumption, the summer months are also a good time to consider using the Medium or Eco power settings. This setting uses only one heating element. Turn the temperature dial clockwise until a comfortable showering temperature has been reached. The flow will also reduce, helping you to save both power and water.
What to do if your electric shower is too cold in winter
During the winter months, the temperature of the incoming cold mains water supply can be much colder than average. During this time, the temperature of your shower may decrease and become too cold.
To set to a more comfortable showering temperature, turn the temperature dial clockwise. This will decrease the flow rate through the shower and therefore increase the showering temperature.
When making adjustments to your electric shower always ensure the shower head and hose are clear from obstructions or blockages. Scaled shower heads can restrict the flow of water from electric showers contributing to temperature issues.
How to adjust your mixer shower or power shower
If you have a mixer shower supplied by the cold mains, your shower will also be affected by the weather. You can increase the water temperature from your water heating system by adjusting the boiler or cylinder thermostat to a higher setting. If required, you could also refer to your installation and user guide and adjust the maximum temperature setting on the mixer control itself. We recommend that your boiler or hot water unvented cylinder is set to deliver water between 55-65˚C.
If you have a mixer shower or an all-in-one power shower supplied by a gravity-fed stored supply, then you might need to increase the maximum temperature setting on the mixer control. Check the hot water cylinder is delivering between 55 – 65˚C.
If you need more information on how seasonal changes can affect your shower throughout the year watch our helpful film on adjusting your shower.
Alternatively, you can speak to a member of our customer service team, visit our contact us page.