Sunflow Heating Thermostat Repair & Replacement
Sunflow Heating Ltd went into liquidation on 5 June 2024, leaving many customers unsure where to turn for thermostat faults, replacement parts, or general support.
We provide clear, honest guidance based on the same principles used in our Thermostat Replacement Guide and Clay Core Replacement Guide, ensuring you always know whether your heater is repairable — and who can help if it isn’t.
1. Older Sunflow Heaters (German‑Made)
✔ Compatible with our Thermostat & Clay Core Replacement Guides
These early Sunflow radiators were imported from Germany and share the same characteristics as the systems we already support:
- Clay‑core heat retention
- Standard wiring layouts
- Third‑party thermostats and control boards
- Replaceable components
- Safe to repair and upgrade
- Parts still available from original manufacturers
Because these heaters follow the same design principles as the systems in our Thermostat Replacement Guide, we can:
- Diagnose thermostat faults
- Replace faulty thermostats
- Replace compatible control boards
- Improve temperature accuracy and efficiency
They also align with our Clay Core Replacement Guide, as the clay core and heater body are long‑lasting and rarely need replacement.
If your Sunflow heater is German‑made, we can help.
More Information About Thermostat Compatibility
If you’re unsure whether your Sunflow thermostat matches the supported models, you can compare it with the photos and instructions on our main guide: More info and prices here
German Heater Thermostat Replacement & Professional Heater Repair Service
2. Later Sunflow Heaters (UK‑Manufactured)
✘ Not compatible with our service
In their final years, Sunflow began producing UK‑made heaters with proprietary electronics. These do not match the standards in our Thermostat Replacement Guide or Clay Core Replacement Guide.
These models include:
- Sunflow‑designed control boards
- Proprietary thermostats
- No third‑party compatible replacements
- Sealed electronics that cannot be safely adapted
- Internal layouts that differ from German‑made heaters
Because of this, we cannot:
- Replace the thermostat
- Replace the control board
- Install third‑party components
- Modify the heater to meet UK electrical standards
3. Who Can Help With Newer UK‑Made Sunflow Heaters?
There are two specialist routes depending on the type of fault.
A) Celsia Systems — Controls & Electronics
Celsia Systems designed and manufactured most of the control boards and thermostats used in Sunflow’s later UK‑made heaters.
They may be able to assist with:
- Replacement thermostats
- Replacement of faulty control boards
- Controls‑related parts
- Technical guidance
Visit Celsia Systems: https://www.celsiasystems.co.uk/sunflow-heating-ltd/
B) SunflowRepairs.co.uk (R80 Property Maintenance) — Heater Repairs
SunflowRepairs.co.uk specialise in:
- Repairs to Sunflow electric heating systems
- Installation of additional Sunflow heaters
- Programming help for Sunflow thermostats
They are one of the few UK companies offering hands‑on repair of the heaters themselves, especially for faults unrelated to the control board.
Visit Sunflow Repairs: https://www.sunflowrepairs.co.uk/
4. Quick Comparison
Based on our Thermostat & Clay Core Replacement Guides
| Feature | Older Sunflow (German‑Made) | Later Sunflow (UK‑Made) |
|---|---|---|
| Matches our Thermostat Replacement Guide | Yes | No |
| Matches our Clay Core Replacement Guide | Yes | No |
| Thermostat type | Third‑party, replaceable | Proprietary, discontinued |
| Control board | Standardised | Sunflow‑specific |
| Parts availability | Good | Celsia Systems only |
| Repairable by us? | Yes | No |
| Heater repairs available? | Rarely needed | SunflowRepairs.co.uk |
| Controls support? | Yes | Celsia Systems (replace faulty control boards) |
5. Not Sure Which Sunflow Heater You Have?
Send us a photo of:
- The heater label
- The thermostat or control panel
- The side profile
We’ll confirm instantly whether your heater is:
- Compatible with our Thermostat Replacement Guide
- Compatible with our Clay Core Replacement Guide
- Should be referred to Celsia Systems
- Or should be referred to SunflowRepairs.co.uk