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17th century, Grade II listed property

Case study
Top view of a heat pump in front of the exterior of a building, showcasing its design and placement.
Top view of a heat pump in front of the exterior of a building, showcasing its design and placement.

  • Utilising Vaillant’s aroTHERM plus air source heat pump to provide heat and hot water to a 17th century property.
  • Aim to support the conservation of the property with low carbon solution.

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  • Building type: Grade II listed property from the late 17th century
  • Technology used: aroTHERM plus 12kW, uniSTOR 250 litre cylinder, 45 litre buffer cylinder
  • Installer: C.P. Jefferies Ltd

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Vaillant hot water cylinder with pipes surrounding it.

System specification

The 4-bed property was originally equipped with an oil-fired boiler system, which supplied aged radiators. The project required an upgrade to remove fossil fuel as an energy source from the property and to provide a highly efficient replacement for heating and hot water.

C. P. Jefferies was approached to propose a solution that would complement the history and aesthetics of the wider estate. The Grade II listed property has undergone renovation to become modernised. The property was complete with stone wall construction, a Cotswold stone-slate roof and a 20th century glazed door, so additional measures were taken to improve the energy rating and heat loss overall.

The outcome

The older, non-restorable materials were removed from the property and replaced with modern alternatives. To support the heat pump installation, the original windows were restored and an additional double-glazing layer was added to the inside. Diathonite (a lime-based insulating plaster) was sprayed onto the stone walls to help reduce heat loss whilst maintaining the property’s breathability. Additionally, MVHR units were installed to address potential dampness levels, should they arise.

C. P. Jefferies Ltd. supported the renovation by upgrading the heating and hot water system. A contemporary standard panel-type radiator system was sized, specified, and installed to ensure comfortable conditions for the homeowner, even with the low temperature flow rates from the heat pump system.

An aroTHERM plus 12kW heat pump was installed, alongside a uniSTOR 250 litre cylinder, 45 litre buffer cylinder, VR 71 wiring centre, sensoCOMFORT control, myVAILLANT connect internet gateway and heat pump interface to complete the system.

Given the nature of the property and its location, maintaining low noise levels during the installation and post-completion was essential. This was another reason for choosing the aroTHERM plus, as it’s Quiet Mark certified.

“The client has been extremely pleased, not only with the performance of the system, but its ability to maintain a higher room temperature of 24°C as per the tenant’s request. All in all, the estate, client, tenant and community have been very happy with the installation and look to further expand the building stock with renewable technologies within.” Jason Rogan, Renewables Division Manager, C. P. Jefferies Ltd.

A man stands beside a van displaying the logo of C P Jeffery, showcasing the company's branding and presence

Why Vaillant:

“The biggest reason for choosing Vaillant is the quality of their products. All other reasons revolve around aesthetics, sound levels, heat pump performance criteria, controllability, and ease of installation, to name a few. Vaillant will be a preferred system choice because their product knowledge is readily available, especially if the products evolve to stay abreast of others, considering the now competitive nature of the market and its counterparts.” Jason Rogan, Renewables Division Manager, C. P. Jefferies Ltd.

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