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Underfloor HeatingSt AustellExtensionRetrofit

Underfloor Heating Retrofit in Kitchen Extension, St Austell

Wet underfloor heating installed in a new kitchen-diner extension in St Austell, connected to the homeowner's existing heat pump system. The UFH delivers silent, even heat across the tiled floor — transforming the most-used room in the house.

Location: St Austell Property: 3-bedroom semi-detached with new extension Completed: January 2026
Underfloor Heating Retrofit in Kitchen Extension, St Austell

The Challenge

The extension was built with a concrete floor slab, with the screed already poured before the UFH decision was finalised. A low-profile overlay system was needed to avoid raising the floor level above the existing internal threshold.

Our Solution

We installed a low-profile 18mm overlay underfloor heating system using aluminium heat-diffuser plates. The system was connected to the existing Daikin heat pump via a new manifold and zone valve, adding a single zone to the existing controls. Total floor thickness added was just 18mm.

The Outcome

The kitchen-diner now heats from a cold start (14°C) to a comfortable 21°C in under 45 minutes. The homeowners report it is now their favourite room in winter. Running cost is minimal given the low flow temperatures from the heat pump.

System Installed

Wunda 15mm pipe overlay UFH system, 1-zone manifold, Heatmiser neoStat-e thermostat, connection to existing Daikin Altherma 3

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