School heating: timetabled zones and half-term savings
School heating is a scheduling problem dressed up as a plant problem. Occupancy is known months in advance, so the money is made by heating only the rooms on the timetable — something a single wet circuit cannot do, and per-room electric radiant can.
What is the right heating system for a school?
Most school heating projects come down to a like-for-like boiler replacement, a heat pump conversion, or targeted electric radiant heating in the spaces the boiler serves badly — and the right answer usually differs building by building on the same site.
The problem with school heating
A school is empty most of the hours it is heated. Boiler-led systems warm the whole site to suit one occupied hall, and mobile classrooms sit outside the wet circuit entirely.
Zoning strategy: Zone per classroom on the timetable, with halls and mobiles on separate independent control.
Options compared
| System | Verdict | Upfront | Running |
|---|---|---|---|
Infrared / radiant panels Ceiling panels per classroom, out of reach of pupils, with timetable scheduling. | Best fit | Low | Medium |
Gas boiler and radiators Cheap fuel, but whole-site zoning is coarse and ageing plant risks mid-term failure. | Viable | High | Low fuel cost |
Air-source heat pump Cheapest per kWh delivered (COP ~3.2) but needs good insulation and capital budget. | Viable | High | Lowest |
Portable fan heaters A trip hazard, noisy in a classroom and the most expensive heat per useful kWh. | Poor fit | Low | Very high |
Indicative annual heating cost — 60 m², average / part-insulated
Degree-day method at UK average 2000 HDD, Ofgem price cap (indicative, 2026). Whole-space figures — zoning typically cuts these substantially.
- Infrared panels£936/yr
- Air-source heat pump£375/yr
- Gas central heating£337/yr
- Old electric / storage heaters£1,200/yr
What school heating costs to install
- Single classroom£900 – £2,200
Ceiling panels plus scheduled thermostat.
- Mobile / modular classroom£1,200 – £3,000
Independent of the main plant, so no boiler works required.
- Hall or sports space£4,000 – £12,000
High-output radiant on occupancy control.
How to size school heating
| Situation | Sizing guide |
|---|---|
| Standard classroom (50–70 m²) | 2.4–4 kW of ceiling or high-wall radiant where the wet system underperforms; 18–20 °C is the usual teaching target. |
| Halls and gyms | High-level radiant zoned to the occupied floor, on timers matched to the timetable rather than a whole-day setpoint. |
| Victorian or single-glazed blocks | Expect 30–50% more output than a modern block of the same area, or fabric work first. |
| Mobile and modular classrooms | Standalone electric radiant with local control — the usual case where extending the wet system is uneconomic. |
| Whole-site boiler replacement | Sized on a heat-loss survey, not on the old boiler's rating; oversized legacy plant is extremely common. |
Disruption and installation time
Schools are almost always done in holidays. A boiler replacement typically needs a full summer break for a large site, plus flue and flushing work. Electric radiant in classrooms is a per-room job of a day or less, so it can be phased across half-terms without losing teaching space — a real factor when a whole-site shutdown is not fundable.
Regulations and approvals that apply to schools
- Building Bulletin 101 for ventilation, thermal comfort and indoor air quality in schools.
- DfE guidance on condition funding routes — CIF for academies and voluntary-aided schools, School Condition Allocations for larger trusts.
- Building Regulations Part L for the replacement of a fixed heating system.
- BS 7671 electrical work, plus safeguarding-compliant contractor DBS checks and site access rules.
- Asbestos register checks before any fixing into older fabric.
Guidance summary only — confirm the current requirement with your local authority, inspector or a qualified engineer before ordering work.
Expensive mistakes in school heating
- Replacing a 30-year-old boiler at its original rating when the building's heat loss has since been reduced.
- Heating a whole block for one evening lettings booking because zoning was never installed.
- Assuming a heat pump conversion works without addressing emitter sizing and fabric first.
- Leaving mobile classrooms on portable fan heaters, which is usually the highest-cost heat on site.
- Missing the funding-bid window, then paying for emergency repairs from revenue budget.
When radiant heating is the wrong answer
Where a site already has a sound gas main, good distribution and a boiler that simply needs replacing, a modern boiler or heat pump serving the existing emitters is normally better value than converting to electric radiant. Radiant earns its place in halls, mobiles, extensions and the rooms the wet system has never heated properly.
What to ask before you sign
- Is the proposal based on a heat-loss survey or on the old plant's rating?
- How is the system zoned against the timetable, including lettings and holiday use?
- What is the phasing plan, and can it be delivered inside holiday periods?
- Which funding route is this being specified for, and does the spec match its criteria?
- What are the projected running costs per block, on current tariffs, with evidence?
School heating: FAQs
Reviewed by the Infrared Heat Solutions technical team · Last updated July 2026 · Data sources: Open-Meteo, Ofgem, Energy Saving Trust