Dual Source Heat Pumps | Pure Thermal

Industrial & Commercial

Dual Source Heat Pumps

Capacities from 30kW to 3000kW and output temperatures up to 120°c

  • Utilise and recycle waste heat from air – liquid flow – hot production areas – process cooling – air compressors – production plant …
  • Operate with an efficient led strategy to enable the dual source heat pump to switch between sources with the highest temperature used first
  • Natural refrigerant hydrocarbon dual or multi source heat pump ranges
  • Output temperatures from 35°c to 120°c plus up to 50°c inlet/outlet DT capability
  • Multiple source options – simultaneous output + cooling + waste heat source plus second or third source capability
  • Ultra low noise dual source input heat pumps with standard 75dB(A) sound power level performance

Industrial & Commercial Dual Dource Heat Pumps for retrofit, new build or process applications

The Pure Thermal team have been at the forefront of the Industrial & Commercial Heat Pump sector for over 15 years and remains committed to delivering the highest performing systems to meet the demands of each application.

Pure Thermal understand that Industrial and Commercial applications call for Heat Pumps solutions that deliver both high performance levels and flexibility in application and this is reflected in the Industrial & Commercial Dual/Multi Source Heat Pump ranges that Pure Thermal offers.

Super Low Noise Pumps

Providing Dual/Multi Source Heat Pumps on a Supply & Commission/Maintain basis the Pure Thermal approach is application based with a committed approach to providing the best advice from the initial concept through to more detailed Heat Pump Selection & Specification discussions.

Pure Thermal Industrial Heat Pumps and Pure Thermal Commercial Heat Pumps are able to provide very high temperature up to 120°C while operating with the Lowest Global Warming/Low Carbon Refrigeration Systems. Whether satisfying a retrofit application or a new project then Pure Thermal have a range of high specification Dual/Multi Source Heat Pumps to exceed the application demands from 30kW to 3000kW+.

Application flexibility is key which is why Pure Thermal Dual Source Heat Pumps are able to operate with a source supply hierarchy based on highest temperature first. This delivers both the lowest operating costs and also the highest levels of carbon savings. Pure Thermal Dual/Multi Source Heat Pumps are available in single stage (Monobloc) or Two Stage system configurations to match an application requirement.

Monbloc Pure Thermal Commercial Dual/Multi Source Heat Pump units with single a stage refrigeration system are able to deliver a 70°C output temperature. This removes the need to specify a cascade or two stage (2 x heat pump) system for medium capacity applications.

For larger application, the Pure Thermal PLUS SO System delivers a Two Stage Dual/Multi Source Heat Pump option to 3000kW+ with single system control & operation. With PLUS SO the control of the first stage Dual/Multi Source Heat Pump and the second stage Water/Water unit is completely self-contained to provide the next generation of large capacity Two Stage Dual/Multi Source Heat Pump systems.

Where waste heat is available a Pure Thermal Industrial Dual/Multi Source Heat Pump can operate with dual or multiple source configuration. This means that the unit will operate as a Dual/Multi Source Heat Pump but importantly also has the ability to operate with a second source to provide increased levels of efficiency. For example, an application may have a cooing requirement through the heating season, but varying in time and capacity, this means that a14°C flow is available from the chilled water return at certain times.

Water Source Heat Pump

Therefore if the external temperature is 7°C then the Pure Thermal Dual Source Heat Pump can operate using the 14°C cooling water return and not lower temperature air as its source heat which increases efficiency and hence uses less input electricity to operate.

Alternatively, Dual Source or Mutilple Source Heat Pumps can be provided by Pure Thermal for both retrofit and new projects.

Identifying the most appropriate system design is key to any project and to assist in this process Pure Thermal Dual/Multi Source Heat Pumps can be provided with a Heat Pump Ready Verification Service which identifies the most appropriate & available system options to deliver the highest level of efficiency. At this stage, the type of Heat Pump is secondary as the focus is on providing the best advice based on the opportunity that the application presents.

The Pure Dual Source Heat Pump range is the next generation of cooling & heating systems, delivering zero cost, zero carbon hot water utilising recycled waste heat from cooling.

A combined system delivering cost & carbon savings.

Contact The Pure Thermal Team for an initial discussion and you’ll find a best advice approach that’s geared completely towards matching the demands of your project with the most appropriate solution.


Dual Source

Dual Source Heat Pumps - Recycle paid for waste heat

Waste heat from manufacturing processes or cooling systems provides an opportunity to utilise a Dual Source Heat Pump.

For example, a hospital cooling system will produce waste heat 365 days per year but with significantly higher waste heat produced over the summer and high ambient periods.

However, the waste heat (from the non-ambient related cooling demand) over the winter period can provide a fantastic source load for the heat pump at a higher temperature than the external ambient.


Surely a heat pump is separate from the cooling system especially where retrofit carbon reduction projects are concerned?

That does not have to be the case as a Dual Source Heat Pump can gain real efficiency benefits by using the second time use waste heat from cooling as it source.


Because the chilled water return temperature is at a higher temperature than the external temperature that the air source would normally operate in.

The dual source heat pump simply takes heat from the chilled water return and uses this heat as its source.

Hence the dual source heat pump delivers higher efficiency and greater capacity than when in air source mode but also displaces the input power to the incumbent chiller as the dual source heat pump also provides cooling.

Does a dual source heat pump only work with chilled water systems?

No the dual source heat pump can operate with any waste heat source be that air or liquid, examples are:

  • Ventilation waste heat
  • Chilled water return flows
  • Condenser circuits
  • Cooling towers
  • Dry cooler circuits
  • Factory production area heat

Are there limitations or restrictions?

The dual source heat pump is flexible and can operate with waste heat temperatures from 12C to 50C, capacities can vary and the method of integration can be adapted to suit particular applications.

Do the loads have to be balanced?

No, the waste heat can be sporadic or varying, the dual source heat pump accumulation system enables the waste heat load to be accumulated in order to provide the most efficient operating conditions for the heat pump.

The dual source heat pump seamlessly switches from air source to waste heat source in line with the application requirements.

Which sectors can benefit?

Any application that creates waste heat which is rejected to the atmosphere at the same time heating or hot water is required:

  • Hospitals/Healthcare
  • Leisure/Hotel facilities
  • Manufacturing plants
  • Processing facilities

Any facility that is decarbonising needs to consider recycling waste heat as the first priority, if there is no waste heat then the application is air source only. But waste heat dual source heat pumps will deliver much lower heat pump operating costs than either air or ground/water source heat pump systems.

Contact the Pure Thermal applications team to discuss how a dual source heat pump could deliver the highest efficiency levels at your facility.

Pure dual output heat pump

15-300kWHot water + cooling

Pure bronze dual output heat pump

Commercial Applications

Existing or new facilities can now benefit from significantly reduced energy costs by incorporating a Pure Thermal Dual Source heat pump system into their installation.

In basic terms the provides simultaneous cooling and hot water or heating outputs using significantly less energy than would normally be required.

For example, if an application requires 100kW of cooling and also requires 100kW of energy to produce stored hot water i.e. a total of 200kW, the Pure Thermal Dual Source CO2 heat pump will satisfy both requirements but will only require the input power to satisfy 100kW of cooling i.e. circa 30kW.

This is achieved by an innovative CO2 refrigeration system that combines both cooling and heating outputs; this system recycles the maximum amount of available waste energy to meet the required demand.

  • Reduce energy use by 50% if the production/storage of chilled water and hot water or heating is required
  • High efficiency with total heating & cooling input power being comparable to that required by a standard cooling-only system*
  • Retrofit into existing sites
  • Specify for new installations
  • Install lower-capacity electrical supplies

Production/Manufacturing Applications

Even when there is no demand for heating or hot water the Pure Thermal Dual Source heat pump system can be specified to efficiently recycle waste heat from chilled water or condenser cooling.

Depending on the requirements of each application the unit can be configured to recycle 100% of a cooling demand or it can be configured to reject heat to the atmosphere as per a conventional Air-Cooled Chiller or Condenser.

The Pure Thermal Dual Source heat pump provides a practical and proven means of producing cooling and hot water or heating 52 weeks of the year.

The typical barriers to the utilisation of heat pumps within a new installation revolve around hot water production. Hot Water production needs to be 65C and above with standard heat pumps unable to provide this output.

In most cases the additional installation costs and running costs of a fossil fuel system to provide the hot water requirements, make heat pumps a less attractive cost and carbon-saving solution.

  • Cooling process, storage & manufacturing systems
  • Cooling range from 35°C to -15°C
  • Satisfy HVAC cooling demands
  • Produce 65°C + energy for heating or hot water
  • Replace direct electric hot water production
  • Replace gas-fired hot water production
  • Supplement solar thermal hot water production
  • Produce virtually FREE recycled energy
  • Produce virtually ZERO CARBON recycled energy

*Efficiency will be dependent on individual project conditions and requirements, an individual illustration can be provided with regard to capital cost, operational costs and return on capital, based on actual site-specific information.

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Start your Dual Source Heat Pump project today with Pure Thermal. Contact our specialist technical support team on 020 3488 4618 for more information.

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