Understanding the installation, running costs and best use-cases for electric and hydronic underfloor heating systems.

Underfloor heating transforms how a home feels—consistent warmth, no visible radiators, cleaner lines. Whether you’re refurbishing a London townhouse or building a new home, choosing between an electric system or a water (hydronic) system is a key decision.
This article explores both options so you can pick the one that aligns best with your property, budget and long-term goals.

Electric Underfloor Heating: The Basics

Electric underfloor systems typically use heating mats or cables installed beneath the floor finish. Quick to install, minimal disruption, ideal for smaller zones like bathrooms or add-ons.
Pros:

• Simple installation
• Thin build-up – less floor height loss
• Great for individual rooms

Considerations:

• Higher running costs (electricity > other fuels)
• Not ideal for whole-home heating
• Lifespan can be shorter, and repair may require lifting flooring

Water (Hydronic) Underfloor Heating: The Alternative

Hydronic systems circulate warm water through pipes laid under the floor screed, connected to a boiler or heat pump. More complex to install but very efficient long-term.
Pros:

• Lower running costs (especially with heat pumps)
• Ideal for larger areas or full-home heating
• Long lifespan

Considerations:

• Greater initial cost and floor build-up
• Works best during new builds or major refurbishments
• Requires planning of manifolds, insulation, system integration

Comparing Key Factors

Factor	Electric System	Water System
Installation Time	Fast – good for room-by-room upgrades	Longer – suited to full property works
Running Costs	Higher per m²	Lower, especially if paired with efficient heat source
Floor Build-Up	Minimal	Significant – must consider structure
Best Use Case	Bathrooms, small zones, retrofits	Whole houses, large rooms, new builds

How to Decide for Your Property

• Small refurbishment or individual room? Electric may be best.
• Full house or new build? Water system likely a smarter long-term investment.
• Insulation, floor finishes, and heat source matter: tile/stone floors are ideal; engineered wood can work, but must be checked.
• Think about future-proofing: if you intend renewable energy / heat pump integration, hydronic systems open more options.

Choosing between electric and water underfloor heating isn’t about “which is better” — it’s about “which is right for your property and goals”. At Sellook Group, we guide clients through the decision, providing tailored advice, cost breakdowns and installation support. Speak to us to find the right solution for your next project.