Underfloor Heating with Heat Pumps: Cornwall Retrofit Guide

Why UFH and heat pumps are made for each other

Heat pumps run most efficiently at low flow temperatures — typically 35 to 45 degrees. Radiators need to be oversized to deliver the same heat at those temperatures, whereas wet underfloor heating works best at 35 to 40 degrees anyway. That match is why almost every new-build Cornwall home we quote for pairs UFH on the ground floor with an air source heat pump, and why we often recommend UFH for retrofit projects that can accommodate it.

Expect a SCOP (seasonal coefficient of performance) uplift of 10 to 20% compared to the same heat pump running radiators only. Over 20 years that is a significant saving.

Wet vs electric UFH

Wet (hydronic) UFH uses warm water circulated through floor loops. Electric UFH uses resistance mats under tiles. The two are not comparable for whole-home use — electric is a finishing touch for cold bathroom tiles, not a primary heat source. Running a heat pump into electric UFH is not possible. For anything bigger than a single room, wet UFH is the only sensible answer.

Screed vs low-profile retrofit

Two broad options for Cornwall retrofits:

• Screed systems — 65–75mm liquid screed poured over insulation and pipe loops. High thermal mass, excellent response curve, but adds floor height and requires stripping back to subfloor. Ideal for extensions or major renovations.
• Low-profile retrofit systems — 18–25mm pre-routed panels that sit over existing subfloor. Much less disruption, faster response (for UFH), and often compatible with heat pump flow temperatures without needing a buffer tank. Good option for granite and slate Cornwall properties where floor levels cannot drop much.

Zoning and controls

Modern UFH manifolds allow room-by-room zoning with wireless thermostats. Pair with a heat-pump-compatible weather-compensation controller and you get smooth, even heat without short-cycling. Avoid the mistake of zoning too aggressively — a heat pump prefers a steady flow through more loops than a boiler does.

Costs in 2026

Indicative installed costs for a typical Cornwall project:

• Screed wet UFH — £75 to £110 per m² including insulation, pipework, manifold and screed.
• Low-profile retrofit — £95 to £140 per m² including panels, pipework and manifold.
• Heat pump pairing — small saving on buffer tank if loop design avoids short cycling.

All of this attracts the 0% VAT relief when supplied as part of a heat pump installation. See our heat pump costs guide for full heat pump pricing.

Getting a survey in Cornwall

We survey UFH projects across Cornwall — from granite village properties to new builds on self-build sites. Contact us to book a free assessment.