Weather compensation
Plain English. Practical detail. UK context.
Weather compensation adjusts a heating-system target in response to outdoor conditions. In a compatible system, it can vary the required flow temperature as the weather changes instead of relying only on a fixed high setting. It is different from load compensation, which responds to the relationship between indoor conditions and demand.
Last reviewed: (editorial review against the public sources listed below).
When it may be useful
Energy Saving Trust describes a weather compensator measuring outside temperature and adjusting the boiler thermostat. The detail differs by heat source and controller, so check actual compatibility rather than buy a sensor and assume it works with every appliance. The system still needs adequate emitters and sensible commissioning. A household with uneven temperatures may also have balancing, insulation or control problems. Weather compensation is one design tool, not proof that every cold room can be corrected by an app or a revised curve. Discuss the intended use pattern before selecting equipment.
The curve and the building
A heating curve expresses the intended relationship between outdoor conditions and a system target. It must suit the building, emitters and heat source. A curve copied from another house may be unsuitable even if both properties use radiators. Installer and occupant feedback can help refine operation while preserving comfort and safety. Trainees should learn what the settings mean rather than chase the lowest number. Sensor position and the interaction with room controls matter. Do not move a sensor or change service-level settings without understanding the product and system requirements.
Regulations and hot-water coordination
Approved Document L gives relevant energy guidance for England, subject to the work and applicable edition or transition. Other nations have their own rules. Meeting a control requirement is not identical to demonstrating good operation in a particular home. Stored hot-water needs and heating-water targets must be coordinated by the designer; lower space-heating temperatures should not compromise the hot-water arrangement. Manufacturer instructions and appropriate electrical or gas competence remain relevant. Weather compensation does not authorise a general fitter to undertake regulated work outside their competence or replace required commissioning records.
A homeowner’s handover questions
Ask which controls remain for normal use, what happens in cold weather, how hot water is handled and whether internet access is necessary. Keep the original commissioning information and record symptoms before making repeated changes. Compare quotes on equipment, integration, setup and support, not merely sensor price. Prices and outcomes vary from job to job, so compare written, itemised quotations rather than relying on a typical figure. For tradespeople, leave clear normal-use instructions and explain that steady operation may differ from a previous on-off schedule. Confirm who reviews persistent discomfort and how any design limitations are reported rather than concealed behind an unfamiliar control label.
Frequently asked questions
Is weather compensation the same as a smart thermostat?
No. Smart controls can provide many functions; weather compensation specifically responds to outdoor conditions within a compatible system.
Should I copy a neighbour’s heating curve?
No. The building, emitters, heat source and control arrangement need their own assessment and commissioning.
Sources and further reading
Public sources and further reading. Sources checked: 8 November 2026. Consult the original for details and later changes.