Underfloor heating for commercial buildings: offices, shops, halls and workshops

Most of the physics is the same as in a house: pipe in or under the floor, a manifold per group of loops, a blended flow temperature and a thermostat per zone. What changes at commercial scale is the size of the numbers. Floors run to hundreds of square metres, loops multiply, and you will usually need more than one manifold, longer primary pipework and controls that can handle many zones and odd occupancy hours.

MaxHeatUFH supplies the full kit for commercial jobs, pipe, manifolds, mixing units, wiring centres and thermostats, with trade accounts, trade prices and next working day UK delivery on orders placed by 12pm Monday to Friday. We do not install; installation is handled by vetted approved installers, and you can start an installation enquiry here.

Does underfloor heating work in commercial buildings?

Yes, and in many ways better than it works in homes. A large open floor plate is the ideal radiant surface: heat is spread across the whole slab, so there are no hot and cold ends to the room and no radiators blocking wall space or walkways. Radiant heat also warms people and surfaces directly rather than relying on moving warm air around a big volume.

The main things to check before committing are heat loss and response time. A well-insulated office or shop with a modest heat loss per square metre is an easy fit. A tall, draughty or poorly insulated building may need more output than the floor can give on its own, in which case underfloor heating can still carry the base load with another heat source topping up. A proper room-by-room heat loss calculation settles it; see our guide to heat loss calculations.

What temperature does each type of space need?

Cooler than a home, in most cases. Published indoor design temperatures for heated buildings give figures like these:

Space	Typical design temperature
Offices, classrooms	20°C
Shops	18°C
Assembly halls, churches	18°C
Workshops, light work	16°C
Warehouses	16°C
Heavy physical work	13°C
Home living room, for comparison	21°C

A lower set point does two useful things. The building loses less heat, so the load is smaller. And the gap between the floor surface and the room is bigger at the same floor temperature, so the floor can give more heat where it is needed.

Can the floor give enough heat for a large space?

Usually, yes. BS EN 1264 limits the floor surface to 29°C in occupied areas, which gives about 100W/m² when the room is at 20°C, roughly 11W/m² for each degree the floor sits above the room. In an 18°C hall or shop, the same 29°C floor can therefore give around 120W/m². Along cold perimeters and glazing, an edge zone may run up to 35°C, which is about 175W/m².

Those ceilings comfortably exceed the heat loss of most insulated commercial floors. Where a space genuinely needs more, the usual answers are better insulation, tighter pipe centres, edge zones at the glazing, or underfloor heating as the base load with door curtains or local heaters covering the extremes.

Which floor build-up and pipe should a commercial job use?

Most commercial underfloor heating goes into screed, because large floors are usually concrete anyway and screed spreads heat well. The common build-ups are:

• Clip rail or staples in screed: pipe fixed to insulation, then sand and cement or flowing screed over. Flowing screeds can be pumped at up to 2,000m² per day, which matters on big pours.
• Castellated panels: pipe pressed between bosses, quick to lay and flexible on spacing.
• Overlay boards: for refurbishments where the slab stays and height is tight.

Pipe is laid in loops back to manifolds of up to 12 ports; a large floor simply uses several manifolds, each fed by correctly sized primary pipework. Our 3-layer PERT-EVOH oxygen barrier UFH pipe and Dualmix stainless steel manifolds cover the common cases. Keep loops to sensible lengths and balance them with flow meters, exactly as in a house, just more of them.

How do you zone and control a commercial building?

Zone by use and by hours, not just by room. A village hall with a main hall, a meeting room and a kitchen wants each on its own thermostat and schedule, because they are rarely all in use at once. An office might zone open-plan areas separately from meeting rooms and reception.

Each zone gets a thermostat and actuators on its loops, wired back through a wiring centre such as the Heatmiser UH8 8-zone wiring centre. App-based control with a Heatmiser neoHub is worth having in any building where the person responsible for heating is not on site every day: schedules, holiday modes and temperature changes are then handled remotely. Our guide to how many zones you need covers the decisions.

What about village halls and other part-time buildings?

Buildings used a few evenings a week need a different control strategy from a 9-to-5 office. A heated screed floor has high thermal mass: it is slow to warm and slow to cool, so switching it fully off between bookings and expecting warmth an hour before an event will disappoint.

The approach that works is setback rather than off: hold the building at a lower temperature between uses and raise it to the occupied set point in good time before people arrive. The floor then only has to climb a few degrees. It also keeps the fabric dry and provides frost protection in winter. Our guides to thermal mass and setback schedules explain how to set this up.

Can a commercial building get a heat pump grant?

Sometimes. The Boiler Upgrade Scheme in England and Wales covers homes and small non-domestic buildings: up to £7500 off an air source or ground source heat pump, provided the building has a valid EPC, the heat pump fully replaces a fossil fuel or electric heating system, and an MCS-certified installer carries out the work and applies for the voucher. The scheme runs until 30 December 2029.

On VAT: the 0% VAT rate on energy-saving materials applies only where a qualifying installer both supplies and installs qualifying measures, and only in residential accommodation, until 31 March 2027. Kit bought supply-only from any merchant, including MaxHeatUFH, carries 20% VAT. See our guide to UFH grants and VAT for the details.

Frequently asked questions

Is underfloor heating good for an office?

Yes. Offices are usually designed to about 20°C, well within what a heated floor can deliver, and losing the radiators frees wall space for desks and storage. Zone open-plan areas and meeting rooms separately so each follows its own schedule.

Can underfloor heating heat a building with high ceilings?

Often better than warm-air systems can. Radiant floor heat warms people and objects at floor level rather than filling the whole volume with warm air first. The building still needs a heat loss calculation to confirm the floor can meet the load.

How many manifolds does a large commercial floor need?

One manifold serves up to 12 loops, so a large floor is split into groups of loops, each with its own manifold placed centrally to its area. Several manifolds running off common primary pipework is normal on commercial jobs.

What temperature should a warehouse or workshop be heated to?

Published design figures are about 16°C for warehouses and light workshop work, down to around 13°C where the work is heavy. The cooler the set point, the smaller the load and the easier it is for the floor to meet it.

Can you run commercial underfloor heating from a heat pump?

Yes, and the pairing is strong: large floor areas allow low flow temperatures, which is where heat pumps are most efficient. Small non-domestic buildings in England and Wales may qualify for up to £7500 under the Boiler Upgrade Scheme through an MCS installer.

Does a village hall need the heating left on all week?

Not at full temperature. Use a setback: hold a lower background temperature between bookings and schedule the rise to the occupied set point ahead of each event. A high-mass screed floor responds too slowly to be switched fully off and on for individual bookings.

Does MaxHeatUFH install commercial systems?

No. MaxHeatUFH supplies the kit and works with vetted approved installers across the UK. Send an installation enquiry through the install quote page and we will connect you with an approved installer.

Sources: Engineering ToolBox indoor design temperatures, GOV.UK Boiler Upgrade Scheme