Heat Sources & Collectors

Sea Water

All at sea

Sea water source heat pumps are ideal for buildings close to the shoreline and marine vessels.

Kensa’s very first heat pump in 1999 was designed to be installed on board a boat and uses sea water as the energy source. Indeed, all Tamar Class RNLI lifeboats have Kensa heat pump systems on board to keep the crew comfortable in high or low temperature conditions

Many RNLI life boat stations also use Kensa sea water sourced heat pumps to heat the buildings.


Sea water collectors

Typically sea water collectors take the form of closed loop Kensa pond mats constructed of slinky pipe attached to corrosion resistant stainless steel frames which are sunk to the bottom of the water source, however open loop methods can be employed, although consideration of the corrosive nature of saltwater on the ground source heat pump should be considered if open loop is to be used.

Pond mats are typically utilised to extract the heat from sea water sources, however methods using boreholes and submerged ‘open loop’ pipework are also used to great success.

Read more

Water works

Sea water source heat pumps have a number of advantages:

  • The heat transfer rate from water is higher than that in the ground;
  • The water is in close contact with all of the pipe at all times enhancing it’s efficiency;
  • The flow/circulation of water provides constant energy replacement;
  • The use of a water source removes the need for digging or drilling, reducing the cost and duration of the installation;
  • The return temperature to the heat pump is generally 5-6°C higher than ground collectors, increasing the efficiency of the heat pump.

Related Content

Installer Enquiry Form

This form will be submitted to Installer Directory

To receive a comprehensive quotation from Kensa please provide details of your project in this form. Mandatory fields marked with a * are required for all quotations.


Company Name (if relevant)

Industry type*

Address (line one)*

Address (line two)*





Project name*

Your role in the project*

Project type*

Project stage*

Likelihood of heat pump going ahead*

Likely start date*

How did you hear about us?*

Add any additional notes here

Size your project:*

Property size is required for all quotes. Please select and provide your property size using one (or all) of the following options:

House size (m²): (Unsure? Map yours here & multiply by storeys)

Upload plans:

House type:*

Number of bedrooms:*

Loft and cavity wall insulation installed?*

Property age:*

Heating distribution:*
Underfloor throughoutRadiators throughoutRadiator/underfloor mix

Domestic hot water production:*

Available ground area (m²):

Preferred collector:

Current heating fuel:
Mains GasElectric StorageLPGOil

Ground floor construction:

First floor construction:

Second floor construction:

SAP available:

Information you supply will be held in accordance with the Data Protection Act 2015.