Pond mats

This section provides details of an example project featuring a cascaded ground source heat pump system fed by a pond mat ground array.

We have provided schematic drawings, example costs and a real-life case study to showcase how a cascaded ground source heat pump system architecture designed by Kensa can effectively meet a high commercial heating and hot water load.

For more information, call sales on 0845 680 4328.


Schematic drawing*

*For illustrative purposes only

Costed example

System architectureCascaded central plant
Total heat pump capacity120kW
Equipment type3x 45kW Plantrooms
Design conditions0/50°C
Potable DHW tempSpace heating only
Integral immersion heatersNo (DNO friendly)
Ground array typePond mats
Pond mats requiredx24 plus header pipework
Lake area required - no flow6000sq/m
* A cost range is depicted here as every project is different and can contain more design features than shown in this example.
**Installation costs for external kit only (costs to install internals equivalent to a traditional system)
***NDHRI is a 20 year index linked funding stream which assumes inflation at 3%
****Based on electric at 15p/kW/hr and COP of 3
*****Based on oil at 45p litre and 85% efficiency

Case study: The Old Farmhouse

The owners of the Old Farmhouse in Lancashire replaced their old, inefficient LPG boiler with a cascaded ground source heat pump system from Kensa to provide heating and hot water to three separate dwellings, thus benefiting from the Non Domestic Renewable Heat Incentive (RHI).

Key facts:

  • Working agricultural farm and c1900 farmhouse;
  • Converted barn and stable buildings;
  • Cascaded ground source heat pump system;
  • 1x 24kW Kensa Twin Compact for heating;
  • 1x 21kW Kensa Hybrid for heating and hot water;
  • 12x pond mats submerged in pond.
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