Expandable Heat Pump Consumer Unit with Spare Ways – WME12/SPH
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £80+
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The WME12/SPH is a 12-way expandable heat pump consumer unit designed for domestic installations where future electrical expansion is expected. It provides dedicated protection for a heat pump while leaving six spare usable ways for additional circuits such as EV charging, solar PV, or battery storage. Supplied factory-assembled with a...
The WME12/SPH is a 12-way expandable heat pump consumer unit designed for domestic installations where future electrical expansion is expected. It provides dedicated protection for a heat pump while leaving six spare usable ways for additional circuits such as EV charging, solar PV, or battery storage.
Supplied factory-assembled with a 100A main switch, Type 2 SPD, and Type B RCD, this consumer unit delivers compliant protection for inverter-driven heat pumps while significantly reducing on-site wiring time. The additional spare ways make it ideal for homeowners planning staged upgrades.
Installer note: A strong choice where a heat pump is being installed now, with EV charging or solar PV planned for the near future.
- Expandable heat pump consumer unit with spare usable ways
- Factory-fitted 100A main switch
- Integrated Type 2 surge protection device (SPD)
- Type B RCD for inverter-driven heat pump protection
- 6 spare usable ways for future circuits
- 12-way metal enclosure
- 18th Edition Amendment 2 compliant
Designed for Future Expansion
The WME12/SPH allows installers to consolidate multiple low-carbon technologies into a single consumer unit over time. Spare usable ways can be populated later for EV chargers, solar PV inverters, battery storage, or auxiliary circuits without replacing the board.
For compact installs with limited expansion needs, a smaller board may be sufficient. For larger properties or multiple planned technologies, higher-capacity expandable boards are available.
Related Expandable Consumer Units
| Product | Usable Ways | Best For |
|---|---|---|
| WME10/SOL1 | Solar-only | Dedicated domestic solar PV installations |
| WME10/SPH | 4 spare ways | Compact future-ready heat pump installs |
| WME12/SPH | 6 spare ways | Heat pump + EV or solar expansion |
| WME14/SPH | 8 spare ways | Medium-size domestic systems |
| WME16/SPH | 10 spare ways | Larger homes or multiple future circuits |
| WME18/SPH | 12 spare ways | High-capacity domestic installations |
| WME22/SPH | 16 spare ways | Maximum expansion & multi-technology installs |
What is the advantage of a 12-way expandable board?
It provides additional spare capacity for future technologies such as EV charging or solar PV without needing a second consumer unit.
Why is a Type B RCD used?
Type B RCDs are required for inverter-driven loads like heat pumps, where smooth DC leakage may be present.
Can spare ways be populated later?
Yes. Spare ways are intentionally left for future circuits to be added as the property’s electrical demands increase.
Is this supplied pre-wired?
Yes. The consumer unit is factory-assembled to minimise on-site wiring and installation time.
- Product Type: Expandable Heat Pump Consumer Unit
- Main Switch: 100A
- RCD: Type B
- Surge Protection: Type 2 SPD
- Enclosure Size: 12-way
- Usable Spare Ways: 6
- Enclosure: Metal
- Application: Domestic heat pump & renewable expansion
This consumer unit is supplied factory-assembled to reduce installation time and on-site wiring. Final connection and commissioning must be completed by a qualified electrician.
- Install in accordance with BS 7671 (18th Edition Amendment 2)
- Ensure SPD earth connections are kept as short as possible
- Confirm Type B RCD suitability for the connected heat pump
- Spare ways can be populated later as additional circuits are required
- Suitable for indoor domestic installations
