Expandable Heat Pump Consumer Unit with Spare Ways – WME18/SPH
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £80+
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The WME18/SPH is an 18-way expandable heat pump consumer unit designed for high-capacity domestic installations where multiple future electrical technologies are planned. It provides dedicated protection for an inverter-driven heat pump while offering twelve spare usable ways for additional circuits such as EV charging, solar PV, battery storage or auxiliary...
The WME18/SPH is an 18-way expandable heat pump consumer unit designed for high-capacity domestic installations where multiple future electrical technologies are planned. It provides dedicated protection for an inverter-driven heat pump while offering twelve spare usable ways for additional circuits such as EV charging, solar PV, battery storage or auxiliary supplies.
Supplied factory-assembled with a 100A main switch, Type 2 surge protection device (SPD) and Type B RCD, this unit delivers compliant protection while reducing on-site wiring time and simplifying commissioning on complex installs.
Installer note: Ideal for larger homes where a heat pump is installed now, with EV charging, solar PV and battery storage planned as part of a staged upgrade.
- High-capacity expandable heat pump consumer unit
- Factory-fitted 100A main switch
- Integrated Type 2 surge protection device (SPD)
- Type B RCD for inverter-driven heat pump protection
- 12 spare usable ways for future expansion
- 18-way metal enclosure
- 18th Edition Amendment 2 compliant
Designed for High-Capacity Domestic Installations
The WME18/SPH is built for properties with higher circuit demands and long-term electrification plans. Its generous spare capacity allows multiple technologies to be added over time without replacing the consumer unit.
This board is well suited to large domestic properties where circuit segregation, expandability and compliance are critical.
Related Expandable Consumer Units
| Product | Spare Usable Ways | Best For |
|---|---|---|
| WME10/SOL1 | Solar-only | Dedicated domestic solar PV installs |
| WME10/SPH | 4 | Compact future-ready installs |
| WME12/SPH | 6 | Heat pump + single upgrade |
| WME14/SPH | 8 | Medium-to-large domestic installs |
| WME16/SPH | 10 | Large homes / multi-tech setups |
| WME18/SPH | 12 | High-capacity domestic systems |
| WME22/SPH | 16 | Maximum expansion & future-proofing |
Who should choose an 18-way expandable board?
This board is suited to large domestic properties with high circuit demand and long-term electrification plans.
Why is a Type B RCD required?
Heat pumps use inverter-driven compressors that can produce smooth DC leakage, requiring Type B residual current protection.
Can multiple future technologies be added?
Yes. The spare ways allow EV chargers, solar PV, battery storage and auxiliary circuits to be added over time.
Is the unit supplied pre-wired?
Yes. The consumer unit is factory-assembled to speed up installation and reduce on-site labour.
- Product Type: Expandable Heat Pump Consumer Unit
- Main Switch: 100A
- RCD Type: Type B
- Surge Protection: Type 2 SPD
- Enclosure Size: 18-way
- Spare Usable Ways: 12
- Enclosure: Metal
- Application: Domestic heat pump & renewable expansion
This consumer unit is supplied factory-assembled to reduce installation time and minimise wiring errors. Final connection and commissioning must be carried out 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 allow future circuits to be added without replacing the board
- Suitable for indoor domestic installations
