Expandable Heat Pump Consumer Unit with Spare Ways – WME22/SPH
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £80+
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The WME22/SPH is a 22-way expandable heat pump consumer unit designed for maximum future-proofing on high-capacity domestic installations. It provides dedicated protection for an inverter-driven heat pump while offering an exceptional sixteen spare usable ways for additional circuits such as EV charging, solar PV, battery storage and auxiliary supplies. Supplied...
The WME22/SPH is a 22-way expandable heat pump consumer unit designed for maximum future-proofing on high-capacity domestic installations. It provides dedicated protection for an inverter-driven heat pump while offering an exceptional sixteen spare usable ways for additional circuits such as EV charging, solar PV, battery storage and auxiliary supplies.
Supplied factory-assembled with a 100A main switch, Type 2 surge protection device (SPD) and Type B RCD, this unit delivers a complete, compliant solution for modern electrified homes — reducing on-site wiring time while supporting long-term expansion without board replacement.
Installer note: Ideal for high-end domestic projects where heat pump, EV charging, solar PV and battery storage are planned as part of a single long-term electrical strategy.
- Flagship 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
- 16 spare usable ways for extensive future expansion
- 22-way metal enclosure
- 18th Edition Amendment 2 compliant
Maximum Expansion, One-Board Solution
The WME22/SPH is designed for properties where long-term electrification is planned from the outset. Its extensive spare capacity allows multiple technologies to be integrated over time without the need for additional consumer units or disruptive upgrades.
This board is particularly well suited to large domestic properties, new builds, or renovation projects where a single, centralised solution is preferred.
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 a 22-way expandable board?
This board is ideal for large domestic properties or new builds where multiple low-carbon technologies are planned from the outset.
Can this board replace multiple consumer units?
Yes. Its high spare capacity often allows all circuits to be housed within a single central board.
Why is a Type B RCD included?
Heat pumps use inverter-driven compressors that can generate smooth DC leakage, requiring Type B residual current protection.
Is the unit supplied pre-wired?
Yes. The consumer unit is factory-assembled to reduce labour time and simplify installation.
- Product Type: Expandable Heat Pump Consumer Unit
- Main Switch: 100A
- RCD Type: Type B
- Surge Protection: Type 2 SPD
- Enclosure Size: 22-way
- Spare Usable Ways: 16
- Enclosure: Metal
- Application: Domestic heat pump & full 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
- Extensive spare ways allow future circuits without additional boards
- Suitable for indoor domestic installations
