Heat Saviour™

 working in association with Hewer FM to future proof Domestic Heating Systems

Heat Saviour is a buffer vessel and plate heat exchanger

future-proofing domestic heating installations

Heat Saviour is compatible with all types of heating:

Renewable Energy Heat Pumps
Ground Source
Oil, LPG, NG System Boilers
Heat Only Boilers


Heat Saviour is a 20 litre buffer vessel with a plate heat exchanger.

Yes! Its design is based on heat pump output of 4kw to 10kw. A Heat Saviour means that the installer and home owner does not need to use manufacturer's components. An independent HP unvented cylinder and a Heat Saviour future proofs a heating installation regardless of changes to heat pumps in the future.

The buffer has a diameter of 520mm x 250mm and has been constructed to sit under the unvented cylinder.

There is no glycol added to the internal heating circuit that would reduce the flow because of high viscosity. The original heat source is removed reducing resistance. The pump collects its heat from the plate heat exchanger thus giving the existing pipework increased flow.

The unit has a buffer volume of 20 litres which is on the heat pump side before the plate-to-plate. As the plate can take up to 8m³/h, flow is maintained.

Yes. The Heat Saviour has been used with Midea® and Mitsubishi® systems. These units do NOT require a minimum water volume so the buffer can be switched to increase water volume on the heating circuit.
The 3kw or 6kw element can be switched on remotely via SMS text or manually, giving temporary heating if the main heat source has failed.
This has been developed for vulnerable housing and is used by facilities management companies looking after housing stock which reduced call-outs and contact during the Covid-19 pandemic.

The unit has a plate heat exchanger to keep the glycol side and the heating circuit separated. The new heat pump pipework is flushed by use of a pump station which reduces the amount of glycol required as the existing heating circuit remains as treated water.

Yes. Due to its position under the unvented cylinder there is no need for excessive pipework, increasing the overall SCOP of the system.

By fitting a suitable mag filter on the return to the buffer.

Yes. The Heat Saviour cover unclips and the plate is attached by 4x nuts. The unit also has drain valves to assist with maintenance tasks.

In a standard installation, the heating element can be connected to a PV installation though a solar boost kit so the buffer would be pre-heated using solar. Even when running, the PV would supply between 800w and 3kw input into the heating circuit increasing the overall SCOP of the system.

Yes. Gas boilers up to 40kw heat only system boilers. Combination boilers will require space for a cylinder and require a full installation. When the Heat Saviour is installed, it requires minor works to switch between a gas or a heat pump.
*HP cylinder must have been installed.

No. It can stand alone if required. If it is installed at the highest point it has 2x ½" female tappings for an auto and manual air vent.

Yes, but due to the glycol side being sealed off from the existing circuit, there is no debris contamination. On servicing the flow rate is checked and passed so the strainer does not need removing. Thus the glycol level does not get reduced due to draining. The internal heating circuit can be drained without the glycol circuit being interfered with and should not require skilled engineers to carry out simple radiator upgrades etc.

Heat Saviour is trademarked and subject to Patent Application No. 2203693.3


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Download Heat Saviour installation manual PDF
Download Wiring Diagrams PDF (to follow)