Many homeowners in Bordon and nearby areas such as Whitehill, Liphook, Alton and Farnham experience the same frustrating issue each winter: radiators hot on one floor but cold on another. This usually points to a circulation problem rather than a boiler failure, and in many cases you can narrow down the cause yourself before calling in a Gas Safe engineer.
Understanding uneven heating between floors
Uneven heating can happen in both modern and older homes, and it usually relates to water flow. When the heating system cannot push hot water evenly around the pipework, the radiators furthest away, highest up or on a specific branch may struggle to heat fully.
Quick checks you can do now
Before assuming a major fault, there are a few simple things you can look at.
- Ensure your thermostat is set high enough.
- Check that individual radiator valves are open.
- Confirm the heating programmer or smart controls are set correctly.
- Listen for gurgling or sloshing sounds in radiators, which may indicate air.
Common causes of uneven heating
Several issues can cause radiators to heat unevenly across floors, especially in multi-storey homes around GU35, GU34 and GU9. Below are the most frequent causes.
- Air trapped in radiators: Air naturally collects at high points in the system, often affecting upstairs radiators first.
- Pump setting too low: If the circulation pump isn’t pushing water strongly enough, radiators far from the boiler may not receive adequate flow.
- Balancing issues: When the lockshield valves aren’t adjusted correctly, some radiators take more heat than others.
- Sludge or debris: Build‑up in pipework or radiators can restrict flow, particularly on older systems.
- Zone valve problems: In two‑zone systems, the valve controlling one floor may be sticking.
Signs your system may be unbalanced
When uneven heating has been developing for a while, you may notice additional symptoms.
- One floor heats quickly while the other barely warms.
- Boiler runs for longer than usual to reach temperature.
- Some radiators get extremely hot while others stay lukewarm.
Homes in Bordon with extended pipe runs or loft conversions see this particularly often.
Uneven heating: how to balance your radiators
Balancing improves flow through each radiator so the system heats evenly. It requires small adjustments and patience, but homeowners can often do a simple version themselves.
- Turn off the heating and let everything cool.
- Fully open every radiator valve.
- Switch heating back on and note the warm‑up order.
- Slightly close the lockshield valves on radiators that heat too quickly.
- Repeat in small increments until radiators heat at a similar pace.
If you have a large property in Bordon or Liphook, or if pipework has been altered during an extension, a professional balance may be required to restore full performance.
When uneven heating points to a deeper issue
Not every case of uneven heating is a DIY fix. You may need professional help if:
- Radiators stay stone cold even when valves are open.
- You suspect a stuck zone valve or failing circulation pump.
- Radiators contain heavy sludge or cold spots despite bleeding.
- Your heating system is old, noisy or slow to warm.
Properties in older areas of Bordon, Alton and Farnham often have legacy pipework that benefits from a health check by a Gas Safe heating engineer.
Next steps if your heating is still uneven
If your home still suffers from radiators hot on one floor but cold on another after trying the steps above, reach out for expert help at (01420) 558993.