Product Information

Open-Loop GSHP Installations

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An Open-loop ground source heat pump installation could:
- Meet all your heating needs
- Meet all your water needs (subject to analysis and suitable filtration)
- Provide an additional grey water supply
and all at a fraction of the running cost of a conventional gas boiler.

How do they do that?
The Earth continually absorbs heat from the sun and stores it in the ground, below the Earths surface. At depths below 1 metre, the ground temperature is consistently between 8°C and 14°C. A ground source heat pump is designed to use this constantly renewed energy to supply domestic heating and hot water.

With an Open-Loop installation, a water supply borehole would be drilled and water at a temperature of around 11°C pumped into the building, where flow could be diverted to feed both a potable (drinkable) water supply and an open-loop heat pump. The heat pump extracts heat from the water and uses it to raise the temperature of water being circulated throughout the house. There are usually two separate water circuits, one for space heating up to 55 °C and another for domestic hot water up to 65°C.

Cooled water at around 6°C is directed from the heat pump back into the ground, where the ground temperature warms the water back up. A harvesting tank can be installed to store the discharge from the heat pump, thereby providing a water supply for garden irrigation or other ‘grey-water’ use. Unlike rain water harvesting tanks that are only replenished when it rains, a heat pump harvesting tank is replenished whenever the heat pump is in operation. If the harvesting tank is buried in the ground, the water starts to reclaim heat immediately.

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About us

Specialists in:
Sewage Treatment Systems
Ground Source Heat Pumps
Water Supply and Soakaway Boreholes

SEWAGE TREATMENT:
Since 1984 H.D. Services has been developing sewage treatment systems culminating with the introduction of their HD-SM in 1994. Over the years we have installed hundreds of HD-SM sewage treatment systems throughout southeast England serving thousands of people.

Our unique modus operandi covers design, supply, installation, commissioning, and servicing. We do not employ agents to sell or install our systems and can take full responsibility for ensuring the discharge complies with the consent issued by the Environment Agency.

GROUND SOURCE HEAT PUMPS:
H.D. Geothermal is part of H.D. Services Ltd, a fully MCS accredited company. We aim to provide the highest quality Open-Loop Ground Source Heat Pump service available in South East England. Our customers can rely on our advice and flexibility to suit their individual requirements and we associate ourselves with suppliers who adopt a similar ethos. H.D. Services Ltd is committed to completing contracts on time and use only directly employed labour.

DRILLING SERVICES:
H.D. Services Ltd. has been constructing water supply and soakaway boreholes in the South East of England since 1984. We have been members of the Well Drillers Association (WDA) since 1988 and have a vast knowledge of the hydro-geology. This means that we can generally confirm the feasibility of a proposed installation upon receipt of a site postcode.

We aim to provide the highest quality, percussion-drilled water supply borehole service available. Our clients depend on our advice and flexibility to suit their individual requirements and we in turn associate ourselves with only those suppliers that have a similar ethos. We are committed to completing contracts on time, using only directly employed labour and our own modern plant.

All drilling works associated with our renewable heating installations and sewage treatment systems are carried out in-house. An initial telephone call to our offices will result in the receipt of a budget proposal with prices for consideration at your leisure. Our engineers can visit the site, free of charge and without obligation, to assess and measure the site.

H.D. Services Ltd are BS EN ISO 9001 and BS EN ISO 14001 certified

PRODUCTS AND SERVICES
Sewage Consultants Services
Sewage Consultants' Equipment & Supplies
Tank Work & Tank Cleaning
Wellborers & Sinkers' Services
Ground Source Heat Pumps

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Articles/Press Releases

10/07/2023 - We’ve been shortlisted for the South East Energy Efficiency Awards
We are pleased to announce that we have again been shortlisted for the South East Energy Efficiency Awards in the category Small Scale Project of the year.
05/05/2023 - H.D. Services achieves High Commendation at the East Midlands Energy Efficiency Awards
We are pleased to announce that we have received a High Commendation at the East Midlands Energy Efficiency Awards in the Small-Scale Project Category, for our installation of an Open-Loop GSHP system in an existing property, which when installed alongside other energy saving materials, saved almost 7 tonnes of CO2 per year.
09/02/2023 - The WDA are delighted to announce election of new Chair and Vice-Chair
The WDA held their Annual General Meeting on the 27th January 2023 at which they elect the chair, vice-chair and secretary for the upcoming year as well as address general matters relating to the running of the association.
28/06/2022 - HD Services Ltd are Winners in the East of England!
Regional Energy Efficiency Awards 2022 Announced
31/05/2022 - We’ve been shortlisted for the South East Energy Efficiency Awards
We are pleased to announce that we have again been shortlisted for the South East Energy Efficiency Awards in the category of RH Installer of the year.
07/03/2022 - National Energy Efficiency Awards 2021.
On the 18th February, representatives of the energy efficiency industry across the nation descended on the Birmingham Hilton Metropole to recognise the best in the industry at the National Energy Efficiency Awards 2021.
17/02/2022 - After a turbulent 2 years, the awards season is again upon us.
10/01/2022 - HD Plans for 2022
Based in Ashley Green, Bucks, H.D. Services Ltd. supply a selection of water, drainage, sewerage and heating services such as sewage treatment systems, borehole construction, ground source heat pumps, and water treatment. H.D. Services Ltd. maintains a well-trained and experienced team with over 30 years’ experience in the industry.
28/09/2021 - After a turbulent 18 months, the awards season is again upon us.
02/09/2021 - Despite the impact of COVID, the last 15 months have been some of our busiest on record.
We have seen a significant increase in the number of enquiries and orders from people wanting to install renewable heating options and utilise our expertise in the construction of boreholes for water supply and the installation of independent sewage treatment systems.
05/08/2021 - Regional Energy Efficiency Awards 2020/21
This year, HD Services Ltd will be attending three Regional Energy Efficiency Awards 2020/21, within the East of England, South East and South West regional categories.
07/04/2021 - Winners of the REA British Renewable Energy Pioneer Award
In its 15th year, the British Renewable Energy Awards hosted its latest 2020 awards evening as a virtual event on 26th January 2021.
06/08/2020 - Adapting our working practices both in the office and on site
Established in 1988, H.D. Services Ltd are an award-winning, family run company operating throughout the South East. We specialise in the construction and development of boreholes and soakaways and the installation and maintenance of independent sewage treatment systems and open-loop ground source heat pumps in the South East.
15/04/2020 - Regional Awards 2020
So, before the world lost its mind and fear took hold, we were doing quite well at the Energy Efficiency Awards 2020!
15/04/2020 - Pond Cottage, Alfriston
In April 2017 we were asked by the architect for a couple, to provide a budget quotation for the installation of an Open-Loop GSHP to heat a new build property in Alfriston, Sussex, which we duly provided.
15/04/2020 - Open For Business
During these uncertain times we want to assure you, our loyal clients, that we are currently open.
15/04/2020 - A warm spring water well may provide renewable heating to a Park Pavilion and primary school in Wales.
A fine example of nature doing what we do, only better! The principal is the same though. Read the article and be inspired!
15/04/2020 - Government urged to target one million heat pumps a year by 2035
The UK must invest in ground source heat pump infrastructure in the 2020s, just as previous generations ploughed money into the gas and water grid, in order to help kickstart the fledgling sector.
30/07/2019 - Discharge legislation is changing - is your system compliant?
The Environment Agency (EA) introduced new rules regarding the discharge of treated sewage by systems installed and in use on or after 1 January 2015.
03/09/2018 - H.D. Services Ltd. at the London Homebuilding and Renovating Show 21st – 23rd September 2018, ExCeL, London
For the past 4 years we have attended the Homebuilding and Renovating Show in London.
10/08/2018 - Energy Efficiency Awards 2018
We are proud to announce that we come Highly Commended!
03/08/2016 - H.D. Services Ltd. at the London Homebuilding and Renovating Show 23-25th September 2016, ExCel Centre, London
For the past 3 years we have attended the Homebuilding and Renovating Show in London.