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Gas Appliance Guide


Thermal store for heat pumps - Gledhill Torrent Greenheat HP


Gledhill Torrent Greenheat HP thermal store

Vented thermal store for use with a Heat Pump





See the new generation of Torrent thermal stores -


TORRENT ECO-HP replaces this model




Gledhill HP Thermal store for use with a heat pump to provide heating and mains pressure hot water

Rather than operating with a conventional carbon fuel boiler as the main heat source this appliance has been designed to operate with an air or ground source heat pump.

However, it still provides mains pressure hot water and provides all the benefits of a vented thermal store outlined in other models.

The mains difference when using a heat pump compared to a conventional boiler is the lower temperatures generated by the heat source pump.

Low storage temperatures can lead to health problems in conventional storage/unvented cylinders.

For this reason it is constantly necessary to boost the hot water temperature using electric immersion heaters to meet Regulations regarding the quality and suitability of the hot water being delivered.

Gledhill Torrent Greenheat HP thermal store for use with a heat pump

With a Torrent Greenheat there are no health issues because the water is being heated indirectly and the lack of a heat exchanger/coil for the heat pump means that the full output is delivered to the store, both of which ensure that less boost is required to achieve an acceptable hot water temperature at the tap.

In fact, the ease with which renewable energy sources, such as wood burning stoves, can be connected to a Torrent Greenheat store means that these are often chosen to provide the boost in preference to electrical heaters.

However, separate immersion heaters can be fitted to boost both the central heating and the domestic hot water sections of the thermal store.

Additional tappings for heat inputs such as a wood burner and/or solid fuel stove can be added if required at a small extra cost.

It is worth remembering the lower temperatures delivered by a heat pump also means that radiators need to be sized to take account of this, or an underfloor heating system that operates at temperatures that can be achieved by the heat pump being used.

Gledhill Torrent Greenheat HP (Heat Pump Model) Technical Manual

Technical Manual

Click image to open

Torrent Greenheat HP heat pump thermal store schematice showing external devices connected

Torrent Greenheat HP Technical Specification and price list







Price inc VAT 989.48 1036.64 1085.59 1493.58 2575.41
Unit height mm 1449 1414 1654 1874 1764
Unit diameter mm 530 580 580 630 730
DHW volume litres 170 210 250 350 450
Max hot water flow rate litres/min 15 15 15 15 15
Maximum Dwelling Type Bath 1 1 1 2 3
Shower room 1 1 2 2 2
Bed 2 - 3 2 - 3 3 - 4 3  - 4 4 - 5

Cylinders are fully customisable - additional tappings may be added or unwanted tappings delete from order. Additions and options may attract a small additional charge.

Additional tappings for solid fuel/AGA (gravity flow) heat input - Please add 20.00 per pair (flow & return)


Optional feed & expansion tank (F&E)
Type 1 Standard F&E tank supplied with standard plastic float and valve 60.00 inc VAT
Metal High temperature copper header tanks are also available. Click here for details


Off-Peak Economy 7 Controller

HE7T Compatible Off-Peak Economy 7 programmer with timed boost function (Details) 115.75

Notes on F&E Tanks

All thermal stores require a Feed and Expansion tank (F&E) to facilitate thermal expansion, evaporation and system top-up. Existing tanks and other proprietary products may be suitable and therefore used. However, your strict attention is drawn to the suitability of any tank you plan to use in view of the temperature of water that could potentially reach it.

You should ensure the tank you intend to use can handle water at the temperatures associated with thermal stores, with special attention being paid to this issue if an uncontrollable heat source is connected (i.e. wood burning stove, AGA, Rayburn etc).

Horrific injury or death from scalding can result if an overflow scenario exists with a tank that distorts or sags when subjected to high temperature water.

Gledhill can supply two types of F&E tank (40 litre*) as an optional extra for use with the Torrent Greenheat thermal store. Both types are plastic and utilise plastics technologies suitable for their intended use.

Type 1 is suitable for use on a standard system where the heat source is regulated (e.g. gas or oil boiler controlled by thermostat).

Type 2 is suited for use with less controllable heat sources such as wood burning stoves or an AGA where heat from the source is unregulated.

*F&E tanks must be sized to take the water expansion of the whole system into account. (i.e. if additional system pipework connects directly to the cylinder the volume of the whole must be taken into account)



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