Heat Pump DNO Notification: Do You Need One?
Most heat pump installations require a simple notification to your electricity Distribution Network Operator — it is free, your installer handles it, and it rarely causes delays. But if your home's electrical supply needs upgrading, catching it early prevents weeks of unexpected waiting.
When you install a heat pump, the additional electrical load on your home's supply may require notification to the Distribution Network Operator (DNO) that manages the electricity network in your area. This is a routine part of the installation process that your installer handles, but understanding what it involves helps you plan your project timeline.
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What Is a DNO Notification?
A DNO notification informs your local electricity network operator that you are adding a significant electrical load to your property. The six DNOs covering Great Britain are: UK Power Networks (South and East England), Western Power Distribution (Midlands, South West, Wales), Northern Powergrid (North East, Yorkshire), Electricity North West, SP Energy Networks (Scotland, Merseyside, North Wales), and Scottish and Southern Electricity Networks.
When Is One Needed?
Any installation requiring a dedicated circuit over 16 amps — which includes most domestic heat pumps — requires notification. Your installer identifies this during the property survey when they check the main fuse rating and consumer unit.
| Main Fuse Size | Typical in | Likely Outcome |
|---|---|---|
| 100A | Most modern homes | Simple notification, no upgrade |
| 80A | Post-1970s homes | Usually fine, depends on total demand |
| 60A | Older properties | Likely needs supply upgrade |
The Notification Process
Your MCS installer submits the notification through the DNO's online portal, typically including the heat pump's electrical specifications, your property address and supply details, and the proposed installation date. Most notifications are acknowledged within 1-2 weeks.
When a Supply Upgrade Is Needed
If your property has a 60A main fuse (common in older homes), the DNO may determine that a supply upgrade is needed. This involves upgrading the main fuse to 80A or 100A, potentially replacing the service cable from the street, and fitting a new cut-out. This work is done by the DNO at their cost in many cases, though some situations may involve charges of £500-£1,500.
If you are also planning solar panel installation, mention this during the DNO notification — both projects have electrical implications for the local network and it is more efficient to address them together.
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Timeline and Costs
The key takeaway: start the DNO process as early as possible. If a supply upgrade is needed, it should be completed before the heat pump installation begins. Your installer should identify this during the survey and start the process immediately.
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Frequently Asked Questions
Do all heat pump installations need a DNO notification?
Not all, but most do. Any installation requiring a dedicated circuit over 16A requires notification to the DNO.
Does the DNO notification cost anything?
The notification itself is free. If a supply upgrade is needed, there may be costs for that work.
How long does the DNO process take?
Simple notifications: 1-2 weeks. Supply upgrades: 2-8 weeks depending on the work needed.
Who handles the DNO notification?
Your MCS-certified installer handles this as a standard part of the installation process.
DNO notification is a routine electrical requirement for heat pump installations in the UK. It connects to the broader installation process, cost planning, and project timelines. Homeowners planning both a heat pump and solar panels can streamline the process by addressing both DNO notifications simultaneously.