Electric Storage Calorifiers


GMS Electric Storage Calorifier

Low installation, maintenance and off-peak costs can make electricity attractive. It can also be a cost effective back-up for other heat sources during periods of low demand and shut-down of the main primary heating source.

Calculating the primary power requirement

For electrically heated calorifiers, the power output is constant irrespective of the water temperature. Therefore the primary power requirement is equal to the average primary power as calculated in our storage brochure. Space must be allowed for withdrawal of the immersion heater for inspection. If withdrawal distance is not known assume full length. We will be pleased to advise withdrawal distances for specific units.

Fixed Elements
Fixed Elements

Lowest cost option but if one element fails, the entire heater must be replaced.

Replaceable Elements
Replaceable Elements

These are fixed to the element plate using special nuts and glands. A failed element can be replaced (after draining the calorifier to remove the heater) without wasting the remaining good elements

Removable Core Elements
Removable Core Elements

The highest cost type. Each heater element can be withdrawn from the immersion heater and replaced without draining down the calorifier.

Element Sheath Material Options (The element sheath is the part in contact with the water)
  • Copper - Most Commonly Used
  • Nickel Alloys - (EG Incolloy) - Recommended for use with hard water)
  • Stainless Steel
Standard GMS Control Panel

Standard Controls Specification


Standard - One temperature control thermostat, one pocket for high temperature limit thermostat.

High Limit Thermostat Option - Gives Protection if the temperature control thermostat fails.

Low Water Cut-Out Option - Stops heater operation and damage if the vessel is only half full.


GMS manufacture electric calorifiers using the following standard materials:

  • Solid Copper
  • Copper-Lined Steel
  • Galvanised Steel
  • Stainless Steel
  • Glass/Polymer Lined Steel
Information Pages


     Some System Considerations

     Ancillary Items

     Thermal Insulation

     Design Standards

     Unvented Packages

Technical Documentation

     Download Data Book

     Download O&M Manual

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