Storage Heater Installation in Merton

About storage heater installation in Merton

Storage heaters store thermal energy during off-peak electricity hours (typically overnight on Economy 7 or Economy 10 tariffs) and release it gradually during the day. Each heater requires a dedicated circuit or a correctly rated spur from a dedicated heating circuit, connected through an off-peak meter or time switch. The installation covers the electrical circuit from the consumer unit, the off-peak switching arrangement, wall mounting of the heater, and commissioning. Modern storage heaters with fan-assisted output and electronic controls offer significantly better comfort and efficiency than older static models.

Storage heaters draw significant current — a single 2.55kW heater draws over 11 amps, and a typical property may have 3-5 heaters totalling 8-15kW. The off-peak circuit must be correctly configured through a time switch or smart meter, with adequate cable sizing and MCB protection for the combined load. Incorrect installation can result in heaters running on peak-rate electricity (tripling your heating costs) or overloading circuits. A new heating circuit from the consumer unit is notifiable under Part P.

What's included

• Property survey and room-by-room heat loss assessment
• Dedicated heating circuit from consumer unit
• Off-peak time switch or contactor installation (if not on a smart meter)
• Cable run to each heater position with correctly rated MCB/RCBO
• Storage heater wall mounting on manufacturer's brackets
• Electrical connection via fused connection unit
• Off-peak switching verification and timing setup
• Full circuit testing to BS 7671 standards
• Electrical Installation Certificate (EIC)
• Part P Building Control notification

Typical cost

Storage Heater Installation in Merton typically costs £350–£800 per heater. Every job is different — describe what you need and a qualified electrician will quote you directly.

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Regulations & standards

• Part P of the Building Regulations (Approved Document P): A new heating circuit from the consumer unit is notifiable electrical work. It must be carried out by an electrician registered with a competent person scheme, or inspected by Building Control.
• BS 7671:2018+A2:2022 (IET Wiring Regulations): Storage heater circuits must comply with the Wiring Regulations, including correct cable sizing for the load, appropriate MCB/RCBO protection, and the requirements for fixed heating appliances.
• Electricity Safety, Quality and Continuity Regulations 2002 (ESQCR): The DNO may need to be notified if the total connected load significantly increases the property's maximum demand. Properties adding multiple high-wattage storage heaters may require a main fuse upgrade.