Thermal Energy solutions

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Thermal Energy - heat pumps and heat recovery systems

We service the commercial sector


Hotels are one of the sectors that benefit the most from heat recovery and heat pumps. Larger hotels tend to have air conditioning that our heat recovery system can recover waste heat from as well as they tend to have very busy kitchens, which the Geyser RO indoor heat pump can recovery energy from. Furthermore hotels have a constant hot water demand.

Hotels of all sizes can benefit from the Geyser heat pumps as they can provide all hot water and heating needs, including for swimming pools and spas.

A great example of the success of using heat recovery is Melia hotels.  Melia is international chain of hotels which have over 400 hotels and started using heat recovery from refrigeration for their hot water generation in the 80’s and are now even installing such systems in their new builds hotels. Furthermore hotels have a constant hot water demand, typically providing a very good ROI.

Restaurants/Pubs/Sports Clubs

Restaurants and pubs tend to have a constant hot water demand. Usually the hot water is provided by either a gas boiler or electricity (either a point of use electric water heater or immersion heaters).

All of this hot water demand could be met by using either heat recovery or a heat pump and in some cases both.

A heat recovery system could be used to get free hot water from;

  • Walk in chillers
  • Walk in freezers
  • Cellar coolers
  • Air Conditioning

If the restaurant/pub does not use any of the above, a Geyser RO indoor heat pump could be installed in the loft space or in the kitchen to provide very cheap hot water.

For space heating a larger Geyser heat pump can be used, even with existing standard radiators.  If the restaurant/pub has access to a water source it is ideal to use a Geyser water sourced heat pump for both heating and hot water.

Typically the payback for restaurants and pubs is 2-4 years, depending on the current set up. If the site uses electric immersion heaters or point of use water heaters the payback will be very good and can even be under 2 years.


Offices tend to have a very low hot water demand. However, the hot water demand is typically provided by electric immersion heaters or electric point of use heaters, both of which are very expensive to use.

This hot water demand could easily be met by using either a heat recovery from the Air Conditioning or even installing a Geyser RO indoor heat pump into a server room where it will provide hot water around 75% cheaper than electric heating and reduce the cost of cooling the server room.


Educational facilities such as schools vary tremendously in their heating and hot water demand. We have surveyed a large amount of schools and without exception we have found several areas where their heating and hot water requirements could be improved. In fact the vast majority is wasting at least 30% of the energy they pay for and often the wastage is over 50%.

The Geyser RO indoor heat pump is perfect for school kitchens, they collect the excess hot air in the kitchen and use this energy to heat water, effectively providing the kitchens hot water demand for free.

Many schools use the same boiler for both their hot water as well as their heating. In winter this is fine as the majority of the demand on the boiler is the space heating. However, during warmer parts of the year there is no need for space heating the school is using an oversized boiler to provide a low hot water demand, resulting in very high energy wastage and unnecessary costs. When steam boilers are being used this wastage can be as high as 97%, i.e. 97% of the energy the school is paying for is wasted.  Using a heat pump to provide the hot water over the warmer months means that the large wasteful boilers can be turned off completely, changing the efficiency from 3% up to 400%.


Hospitals are one of the sectors that can benefit immensely from heat recovery. They tend to have large cooling systems, typically using air handling units and water chillers which provide cold water for the air handling units. Considerable energy can be recovered from these chillers and be used for hot water generation. Furthermore there tend to be various other cooling system which could also be used, such as;

  • MRI chillers
  • Direct cooling systems
  • Water chillers
  • Walk in fridges & freezers
  • Server & computer rooms

Even if the hospital has a combined heat and power (CHP) or is planning on one, installing heat recovery should be installed as it will reduce the energy consumption on site, not just provide it cheaper as a CHP does. Furthermore a CHP should be designed based on the minimum thermal base load and heat recovery reduces this base load. This reduces the size of CHP that is required, saving on both operating expense (CAPEX) and capital expenditure (OPEX).

Food & drink producers

The food and drink production sector is the optimum sector to be using heat recovery.

Constant cooling and refrigeration demands as well as a constant need for hot water make heat recovery a must for any food and drinks producer wishing to reduce their energy consumption. The heat recovery captures the energy from the cooling system and re-uses it to provide hot water. If even more hot water is required we can provide that by using large capacity heat pumps, removing the need for burning fossil fuels.

Areas where energy can be recovered from;

  • Air Conditioning
  • Process cooling
  • Water cooling
  • Warehouse cooling
  • Blast freezers
  • Ice machines
  • Foodstuff contaminated hot water (even though the water itself cannot be re-used, the heat from the water can be)

Areas where the recovered energy can be re-used;

  • Cleaning
  • Boiler and steam pre-heat
  • Potable hot water
  • Ice melting
  • Various processes
  • Space heating
  • Drying

Take away Restaurants

Like restaurants and pubs, take away restaurants tend to have a constant hot water demand.  Usually the hot water is provided by either a gas boiler or electricity (either a point of use electric water heater or immersion heaters).

As take aways tend to have very little cooling demand, a small walk in fridge at the most, the best solution for them is to use the Geyser RO indoor heat pump. It can be installed in the kitchen, cooling and dehumidifying the air whilst at the same time provide a cheaper alternative to using fossil fuels for their hot water.

Typical payback for a take away is 3-4 years.


Bakeries are perfect for the Geyser RO indoor heat pump, much like commercial kitchens there is a lot of humid heat in the bakeries that can be used by the RO to provide the hot water needed. This can be boosted if chillers are used by utilising the heat recover unit on the chillers. Chillers work by extracting heat from inside the fridge and dumping it outside, so why not use this heat to reduce your hot water costs.

Listed buildings

Listed buildings are notoriously difficult when it comes to improving energy efficiencies and the renewable energy options available are very limited as solar panels and air source heat pumps typically don't fulfill the requirements of listed buildings.

We offer 3 different options for listed buildings;

  • Geyser RO indoor heat pump - Is designed to be installed inside the building in warm areas such kitchens and loft spaces.
  • Geyser water source heat pump - Can use any nearby water source to provide both heating and hot water.  The water source can be a lake, a river, a canal, a borehole and even the sea.  This heat pump also works as ground source heat pump.
  • Geyser heat recovery - If the site is using any cooling on site such as walk in fridges or freezers and/or air conditioning, using a heat recovery unit to recover energy from the cooling systems can provide some or all of the hot water requriements on site.


Leisure centres and gyms tend to be very warm which means that air conditioning is typically always on, even in winter. The heat that the cooling system removes can be captured and re-used using heat recovery, providing thousands of litres of hot water every day.

Free hot water is only the beginning. Recovering the energy from the air conditioning will also reduce the energy consumption of the air conditioning system itself, increasing the savings even further. This means that typically we see a ROI of only 2-3 years for Leisure and sports complexes.

To see our multi award winning installation for Nuffield Health click here


Manufacturing varies considerably between sites and processes. Our broad knowledge along with various technologies means we can often identify areas where energy can be re-used within the manufacturing plant. Our designs are based on using equipment that can be retro fitted, ensuring minimal disruptions to operations and fast ROI’s

A Variable & Controllable Cost

Thermal energy (space heating, refrigeration, air conditioning, steam, drying & hot water), is not an overhead nor a fixed cost. It is a variable and controllable cost. The cost of operating and maintaining thermal energy systems is based on a number of variables, such as energy cost & consumption, standing charges, carbon taxes, equipment and system efficiencies, climate, insulation, human behaviour and controls to name a few.

Focusing on only a part of your thermal system will only yield a small overall benefit if the other variables remain the same. Therefore it is essential to have a holistic view over all of the thermal systems on your site to ensure they are as efficient as possible. We will work with you to improve overall efficiencies and implement improvements that ensure minimum energy wastage, a reduction in reactive maintenance demands and ultimately save you money.