Frequently Asked Questions

How do you operate storage heaters?

For the basic operation of storage heaters, please see our technical downloads section to find the manual for your heater.

How do you operate panel heaters?

For the basic operation of panel heaters, please see our technical downloads section to find the manual for your heater.

Do Heatstore manufacture an electric shower for use in local authority or health care sectors?

Heatstore have an Auto Flow Thermostatic range of showers which constantly monitors the flow and temperature at up to 4 times a second to enable the unit to control the temperature to within +/-0.5ºC. The ‘Thermalock’ control ensures a higher temperature cannot be accidently selected without the operation of a push-button override. It conforms to the most recent and stringent of NHS guidelines set down to ensure safe showering in the care market and is also available in an extended hose and rail Care Pack option.

Can a Heatstore shower be connected to a cold mains supply?

All instantaneous showers should be connected to the rising mains water supply, unless the unit is a Power Shower or Pumped Electric unit, as there are limitations on water services in order for the unit to perform correctly. Units can be connected to a header tank providing there is adequate head height to generate a minimum of 0.7 bar pressure.

Can a Heatstore power shower be fitted to a combi-boiler?

No, we do not recommend any Heatstore shower is fitted to a combi-boiler. Our power shower would be fitted to a hot tank and cold tank supply, our Aqua Flow shower would be fitted to a cold tank supply. All other showers would be recommended to connect to the rising mains water supply.

Does the wiring to my existing electric shower need to be upgraded if I fitted a higher kilowatt rated unit?

It depends on the kW rating of the shower being installed and what wiring/breakers are already installed. All wiring must be carried out by a fully qualified electrician and must comply with the current wiring regulations to meet the specification of the unit to be installed.

What can I do if there is not enough mains water pressure to operate an electric shower?

If there is in-sufficient water pressure for your unit it would normally be down to a poor service from your service provider “lines could be blocked or restricted”, if this is not the case then your unit could be fed from a header tank with an adequate working head height. Please contact the Heatstore Technical Department for advice.

What is the minimum water pressure required for a Heatstore electric shower?

The minimum running water pressure for the shower unit is 0.7 Bar.

What things do I need to think about when replacing an existing electric shower?

If replacing an existing unit you must ensure that your water and electrical services are adequate for the unit to be installed.

What size fuse does a Heatstore electric shower require?

The installation must comply with the current wiring regulations to meet the specification of the unit to be installed. This all depends on the kW rating of the shower unit. Please see below:

7.2kW shower32 Amp fuse
7.5kW shower40 Amp fuse
8.5kW shower40 Amp fuse
9.5kW shower40/45 Amp fuse
10.5kW shower45 Amp fuse

Please note in order to comply with the current building regulations you should have a competent certified installer carry out any electrical work to the latest IEE Wiring Regulations.

What Heatstore shower will suit a gravity system?

A power shower or Pumped Electric unit are the only recommended units as there are limitations on water services in order for any shower unit to perform correctly. Standard mains shower units can only be connected to a header tank providing there is a adequate head height to generate a minimum of 0.7 bar pressure.

Do I need a pump?

You can only pump water from a storage tank to feed to a shower; you can not pump mains water directly to a shower as it goes against local water by-laws.

What effect does the kW rating have on my electric shower?

Electric showers only take water from your mains cold water supply and heat this water by passing it over electrically heated elements. The temperature of the water you get from your shower and the flow rate is therefore determined by three key factors:

  1. The temperature of your mains cold water supply (this can vary from 5ºC in winter to 20ºC in summer)
  2. The heating ability of your element in kW
  3. The pressure of your mains water supply

In simple terms, the higher your chosen showers kW rating the better the potential water flow rate from your shower at your preferred showering temperature. As a guide you can see below how the kW rating affects your shower flow:

  • 8.5kW up to 27% more flow than a 7.5kW heater
  • 9.5kW up to 42% more flow than a 7.5kW heater

What type of plumbing fitting is required to connect to the inlet of a Heatstore electric shower?

An easy fit or compression fitting is required to connect to the unit, providing they meet the specification of the installation.

When installing a Heatstore electric shower, what size electric cable is required?

The installation must comply with the current wiring regulations to meet the specification of the unit to be installed. Recommended cable size:

7.2kW shower6 mm² cable size
7.5kW shower10 mm² cable size
8.5kW shower10 mm² cable size
9.5kW shower10 mm² cable size
10.5kW shower16mm² cable size

However please note in order to comply with the current building regulations you should have a competent certified installer carry out any electrical work to the latest IEE Wiring Regulations.

What happens when an incorrect fuse size is fitted for an electric shower?

If the fuse is under rated then the fuse will keep blowing. If the fuse is over sized then if there is an electrical problem then the unit could burn out and this could be a potential fire hazard.

What water and cable entries do Heatstore showers have?

Most units unless other wise stated have the water entry on the bottom right hand side of the unit that can be connected to a water supply coming from bottom, rear or top of the unit. The electrical connection block is located on the right hand side, mid way and has a top and bottom knockout section + rear cable entry top. However for an ideal replacement shower where more entry points may be required to accommodate existing pipe work and wiring, the Aqua Premier Electronic offers left, right, top, bottom and rear options for water and cable entries.

Water is leaking from the bottom of my shower unit, what could be the problem?

If water is leaking from the base of the unit it could be due to the shower being over pressurised (a build up of lime scale or a bent/restricted shower hose). Water will be coming from a small black pipe behind the shower hose. Please contact Heatstore Service on 0117 923 5375 for advice on how to rectify this.

Where can I find the serial number on my Heatstore shower?

All serial numbers are located on the bottom left of the unit next to the water out-let hose

The flow of water from my Heatstore shower seems very poor, what could be the problem?

If you experience poor flow from your unit this could be due to poor water services or that the unit is being used on half heat setting and trying to achieve a hot shower “increasing the heat setting should increase the water flow rate”.

What accessory packs come with the Unvented water heaters?

The HS10 & HS15U unvented water cylinders do not come with any accessory packs as it depends upon the individual installation. If required Pressure Reducing Pack A – 0380, Expansion Vessel Pack B – 0380 and TMV2 Thermostatic Blending Valve Pack C – 0382 may be purchased separately.

The HS30U and HS50U unvented water heaters are supplied with the pressure reducing valve & expansion vessel kits required to install these products. If required a TMV2 Thermostatic Blending Valve Pack C – 0382 may be purchased separately.

The HSUDC and HSUIC unvented water cylinders are supplied with the pressure reducing valve and expansion vessel kits required to install these products. If required a TMV2 Thermostatic Blending Valve Pack C – 0382 may be purchased separately.

What diameter are the HSUDC unvented units?

The HSUDC Unvented Water Cylinders are all 550mm in diameter.

Can the HSMF Multiflow be used to heat sinks and baths?

The HSMF Multiflow will not be able to provide sufficient flow for sinks or baths as the open flow of a sink tap is greater than the products capability to supply hot water at a suitable temperature. Our Unvented water heater range would be able to provide for these applications. Please contact the Heatstore Technical Department for sizing.

Can the HSFB Flow Boiler be used to directly supply basins, sinks and baths?

No, Our Unvented water heater range would be able to provide for these applications. Please contact the Heatstore Technical Department for sizing.

Can the Point Of Use water heaters (HS55, HS65 & HS75) be plumbed to taps?

Yes but the taps have to be Vented Taps rather than standard taps. Heatstore have a range of suitable vented taps. Please contact the technical department for more information.

Can the Point Of Use water heaters (HS55, HS65 & HS75) use the unvented water heater packs to use normal taps?

No, the Pack A-0380 & Pack B-0381 and Pack C-0382 can only be used with the unvented water heaters. Heatstore have a range of suitable vented taps. Please contact the technical department for more information.

Can the Point Of Use water heaters (HS55, HS65 & HS75) be plumbed to more than one outlet?

No, however Heatstore have a range of unvented water heaters to cover multiple outlets for small or large applications.

The Point Of Use water heaters (HS55, HS65 & HS75) sometimes drip from the spout when heating. Is this normal?

This is normal and not a fault with the product, as this is due to the way the product vents when heating the stored water.