- Electric Calorifiers
- Materials of Manufacture
- Insulation
- Ancillary Equipment
- Ormandy Type References
- Sizes and Dimensions
- Hot Water Demand Requirements
- Immersion Heaters
- Control Panels
- Unvented Systems
- Immersion Heater Maintenance
- Element Failure Checks
- Fault Finding Chart
There are several immersion heater formats offered by Ormandy. These include fixed element, replaceable elements and removable core. Several factors require consideration when selecting the most appropriate design for a particular application. The following comparison chart illustrates the main differences between these three variants.
FIXED ELEMENT
- Calorifier must be drained in order to replace the entire heater.
- Most compact heater, generally used for low output applications with screwed heater connections.
- Available in a range of watts densities ranging from high to low.
- Rapid replacement once the calorifier is drained.
REPLACEABLE ELEMENT
- Calorifier must be drained in order to replace heating elements.
- Compact design.
- Available in a range of watts densities ranging from high to low.
- Replacing elements requires the removal of the immersion heater from the calorifier. Draining, removal, refitting and flooding can take several hours.
REMOVABLE CORE
- Cores can be replaced without draining the calorifier.
- Large design generally requiring a larger vessel neck in order to accommodate heater sheaths.
- Low watts density.
- Cores can be replaced rapidly. Ideal solution for systems with a single calorifier or installations where down time cannot be tolerated.
Nickel Alloy is the preferred sheath material for fixed and replaceable elements. For domestic water duty the Watts density should be limited to a maximum of 7.75 watts/cm sq. (50 watts/inch sq).
