EFH Electric Flow Heaters
Some System Considerations
- Pressure Relief Valve: Needed for all unvented calorifiers and where working pressure exceeds 25 m.w.g.
- Anti-Vacuum Valve: Anti-vacuum valves are needed for all copper-lined steel calorifiers. They may also be fitted to copper calorifiers where there is a possibility of partial vacuum.
- Automatic Air Vent: Normally only needed on unvented systems.
