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Our cascade heat pump

Clade Larch cascade heat pumps are a combination of our r290 air source heat pump and r600a water source heat pump.

The benefits of this system are the close matching of flow and return temperatures to those of traditional boiler system of 82⁰C / 71⁰C.

What is a Larch heat pump?

The Clade Larch Cascade heat pump is actually two heat pumps working together to produce temperatures that can directly replace a boiler, for example 82⁰C flow, 71⁰C return.

Unlike other manufacturers Clade’s Larch is not just a combination of standard products that the designer and installer has to somehow make work, rather it is a specifically designed pair of LT and HT heat pumps that work in harmony for maximum efficiency.

Clade use a combination of hydrocarbon refrigerants , again this optimises efficiency by allowing each different working fluid to work at optimal conditions. The LT system uses r290, propane, and the HT system uses r600a, isobutane.

Why specify a Larch heat pump?

Some buildings have heating systems that are really difficult and expensive, or have critical processes that mean a conventional heat pump can not be used. Examples include historic one pipe heating systems and some textile manufacturing processes.

By specifying a Clade Larch heat pump the impact on the building or process is zero yet the heat is decarbonised and the end user can also take advantage of flexibility incentives on the power grid.

150 kW
250 kW
350 kW



Clade offers full technical support from our Leeds Technology Centre.

  • Design assistance – we have an in house design team who are experts in heat pump system design.
  • Product – our products are developed by ourselves from metal frames to the digital controls. Our experts are on hand to assist with any issues or adaptions required.
  • Installation support – Our full service installation team can arrange delivery, install and carry out specialist services to ensure a successful project.
  • Commissioning – Our own commissioning Engineers will set up, test and handover your heat pumps. Our team are some of the UK’s leading experts in this field.
  • Aftercare – All servicing and repairs are taken care of, we use online tools and field technicians to ensure maximum availability and reliability.


The future value of heat pumps will largely depend on rewards for providing grid flexibility and on optimal efficiency in all conditions. Clade heat pumps are fitted with high specification PLC controls that are networked to cloud services, delivering multiple benefits.

The Clade digital platform enables continuous operational improvements and lower service and maintenance costs.

  • Data is captured, analysed and insights generated to improve performance
  • Alerts and alarms can be raised automatically
  • Online diagnostics save call out time and charges

The Clade digital platform provides dispatch services via pre-built access to the flexibility market or time of day tariff control.

  • Time and control of thermal storage for tariff and timing optimisation
  • Access to grid flexibility platforms
  • Safe operation of the heat pump in response to market signals that maintains warranty
  • Performance and data analytics, reporting in multiple formats


Heat pump performance is dependent on four major sets of variables; the ambient conditions, the demand conditions, the physical health of the heat pump and the controls.

The ambient and demand conditions are variable across the day, week, season and year. This means that optimal year round performance is only achieved over a period of time.

Clade Aftercare package provides the basic maintenance services which maintain the physical health of the heat pump and a series of services that optimise heat pump operation over time. These optimisation services are provided by Clade’s expert Engineers who are on hand to analyse and assist improvements throughout the contract.

Clade Optimisation Services


Speak with our team of experts and discuss your requirements. Complete this quick form and we will be in touch or contact us using:

0113 887 9604

Bristol & Bath Science Park
Dirac Crescent, Emersons Green
Bristol, BS16 7FR

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