The focus of our case study is a listed building in Westerham, Kent, which was once the residence of William Pitt the younger.
Westerham is a small town steeped in history, and features Chartwell, home of Winston Churchill, Downe House, home to Charles Darwin, and Squerryes Court. Chevening, the deputy prime minister’s estate, is just down the road.
Featuring timbers that are believed to date back to the 13th century, in more recent times William Pitts’ former house has been an upmarket restaurant, and an Indian fine dining eaterie.
The present owners purchased the property in a state of dilapidation, and set about a total renovation.
Many of the period features were retained or where time expired, sympathetically renewed in a manner acceptable to English Heritage.
Hot Water & Central Heating Ltd were asked to provide a design and specification for complete new heating system and hot water services, all to be sited in a below ground cellar area in the original building.
Because the cellar had no mains drainage, we used a thermal store as the energy source for the hot water. We would normally use unvented cylinders for this type of domestic application, but the arrangements in sealed subterranean locations do not allow for a reliable expansion relief system.
All water was to be mains pressure, and since the houses along this stretch of road share water supplies, we augmented the water supply to the heatstore with a TWS accumulator system.
The rear of the property was extended at ground level to include a modern kitchen complex and rear patio.
A Worcester Bosch CDi system boiler was fitted within the cellar, featuring their recent high level expansion relief modification accessory.
We installed a full Nu-Heat underfloor heating system in some old ground floor parts of the house, and the new kitchen and utility areas, comprising 6 zones of heating.
In the entire hallway the old clay tiles were dug up, insulation, underfloor heating and screeding laid, and then the tiled floor relaid on top, exactly as it was before. Except much warmer! Expansion joints were fitted as necessary.
In the remaining parts of the property we fitted Vogel & Noot panel radiators.
The whole system is run by a Honeywell v3 Evohome, giving 12 separate zones of individual heating control across the property, together with hot water monitoring and control.
The whole property has been transformed into a beautifully designed residence, mixing the old and the new. All credit to the architect and the customer; we are proud to have played a small role in the work.
NB: This is the second large project we have carried out for this customer’s family, there is a Viessmann Vitocrossal 300 commercial installation in a large office complex nearby.