Ground Source Heat Pump Installers

Evergreen are experienced installers of Ground Source Heat Pumps across Dorset, Devon and Somerset, enabling you to heat your home in an environmentally friendly way and qualify for the BUS Boiler Upgrade Scheme

Evergreen have a great team of qualified, experienced and product trained engineers. We have been installing renewable technologies since 2011 throughout Dorset, Devon and Somerset. 

We fit the excellent and British made Kensa Heat Pumps. See their website for further information:

What is a Ground Source Heat Pump?

Ground source heat pumps are extremely energy efficient, for every one unit of electricity used (to drive the pump and compressor), around 4 units of heat are produced. Buried pipes or ‘slinkies’ are used to absorb heat from the ground. Other methods include ‘pond mats’ or ‘open loop’ systems which take heat from ponds, lakes or rivers.

Evergreen are the leading Ground Source Heat Pump installation company in Dorset, Devon & Somerset

Slinkies Preparation for Ground Source Heat Pumps
Ground Source Heat Pump Slinkies
Close up image of slinkies for Ground Source Heat Pump Install

How Does a Ground Source Heat Pump Work?

It seems strange to think that a property's entire heating and hot water needs can be provided by latent heat in the ground or from a cold water source. How can you get hot water and heating from the ground which is below 12°C?

The sun heats the ground throughout the year. Heat from the ground is absorbed at low temperatures into a fluid contained in loops of pipe buried in the ground. The fluid is pumped around the loop picking up heat as it goes. When it gets back to the heat pump, heat is extracted via a heat exchanger. The fluid is then passed through a compressor where the increase in pressure causes an increase in vapour temperature. This heat is then used to provide space heating and hot water.

It is a tried and tested technology. The same way a refrigerator extracts heat from the inside of the fridge and transfers it into the kitchen, so a ground source heat pump extracts heat from the ground and transfers it into a heating or hot water system.

Open-loop water source heat pumps work in a similar way, only water is extracted and passed through a heat exchanger and the water returned to its source. There is no closed loop as with Ground Source Heat Pumps.

There are several different ways of extracting heat from the ground or water source, Evergreen has experience of them all.

For a fuller, in-depth read - check out our article on How Ground Source Heat Pumps work.

What are the Advantages of Ground Source Heat Pumps?

Low Running Costs

Heat pumps run on electricity. Running costs are comparable with natural gas fired systems, and lower than oil, LPG or existing all electric systems. If you have a solar PV system, then free self-generated power can contribute to the running of the heat pump, further reducing running costs

Reduce Your Carbon Footprint

Heat pumps are a green technology. Heat pumps do have an impact on the environment as they need electricity to run. However, they are very efficient and the electricity grid is getting greener, relying less on fossil fuels. The heat extracted from the ground or water source is constantly being renewed naturally.

No Fuel Deliveries Required

No LPG or oil deliveries required, and no connection to the gas grid needed either. Heat pumps run on electricity and most homes are already connected to the electricity grid. For this reason heat pumps are often ideal for properties in rural or more isolated locations.

Get Paid for Going Green

The Boiler Upgrade Scheme (BUS) launched in Spring 2022 to aid the decarbonisation of buildings. We are registered installers under the scheme and charge an admin fee of £195. You and your property must meet all the eligibility criteria and there are a limited number of vouchers per year, therefore we cannot guarantee acceptance onto the scheme or a successful outcome, but we will do our best to secure any funding available.

Low Maintenance Costs

Heat pumps are very reliable. We recommend annual servicing to ensure your heat pump runs efficiently for many years.

This short video by Kensa Heat Pumps gives a great explanation of what a heat pump is and how a ground source heat pump works. Evergreen are accredited installers for Kensa Ground Source Heat Pumps and have worked with them since 2015.

What type of systems does a Ground Source Heat Pump have?

Closed Loop Systems

Pipes are buried in the ground or submerged in water. A fluid is circulated through this 'closed loop' picking up heat as travels.

Types of Closed Loop Systems:

Slinkies, pipes buried in the ground (the most common method)

Boreholes, deep holes drilled vertically into the ground, typically 100m deep, (usually considered when available land area is limited)

Pond mats, coils of pipes are submerged in a pond or lake and heat extracted from the water

Open Loop Systems

Water is extracted from a river or other water source and is passed through a heat exchanger before being returned

Types of Open Loop Systems:

River - Water is taken from a river or stream, heat extracted via a heat exchanger and returned to the river or water course

Artesian well - Water under natural pressure is passed through a heat exchanger

Delighted with the service we had from Evergreen

It is a pleasure, but very rare, to be in a position to write to any firm to tell them that we are most happy with their service. From the first day we contacted yourselves we have noticed a positive ‘can do’ attitude, and this has been justified by the actions and results since that day. The positivity has been reinforced by each member of the company we have had contact with, and the quality of the work that has been done and is apparent backs up the assurances given.

The depth of knowledge that has been demonstrated, and has been proven, has given us a degree of peace of mind; specifically we were most impressed that when we were faced with a potential difficulty in regards to power supply you went the extra mile and, through discussions with Kensa Heat Pumps, were able to re-engineer matters to resolve the situation.

Whilst we have had specific contact with Paul and Ian, and those who installed the Ground Source Heat Pumps on site, we are sure that all the team including those backroom staff whom we might not have dealt with directly are of the same positive attitude and professionalism.

Thank you all. We are delighted with the service we have had from Evergreen.

Case Studies

Ground Source Heat Pumps: Pros and Cons

Thinking of installing a ground source heat pump in your property? Let us guide you through some of the pros and cons to consider before making the investment.


How to maintain a Ground Source Heat Pump

There are a multitude of benefits associated with the installation of a ground source heat pump at your property; from the long term economic gains, to the reduced environmental impact.  


Ground source review: Horsey Farm

Two Kensa 9kW Evo’s were installed as a cascaded ground source heat pump system in a 19th-century farmhouse in Somerset to provide 100% of the heating and hot water requirements.


Ground source review: Green Gables family home

Green Gables is a family home in Somerset, consisting of two attached buildings. Looking to save money on heating bills and reduce their carbon footprint, the homeowner wanted to rule out their reliance on oil heating.


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