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Getting a new electric meter installed sounds straightforward: an engineer visits, swaps out the old unit, and tells you everything is sorted. But for a surprising number of homeowners, the weeks that follow bring something nobody warned them about: their heating stops working properly.
The storage heater no longer charges overnight. The electric boiler throws fault codes that it has never shown before. The smart thermostat loses its schedule. Energy bills creep up, and nobody can explain why.
None of these are coincidences. A new electric meter, particularly a smart meter, interacts with your heating system in ways engineers on the doorstep rarely explain. This guide explains what can go wrong, why it happens, and how you can deal with it.
Why a New Meter Affects More Than Just Your Readings
Most people think of a meter as a passive device that counts electricity use. Swap one for another, and nothing changes; that’s where issues usually start.
Your meter controls your tariff, when your supply switches, and whether certain circuits get any power at all. When that device changes, the relationship between your supply and your heating can shift in ways that take days or weeks to become obvious. The harm of having a new electric meter installed is not always immediate; sometimes it builds quietly while you pay more, heat less, and wonder what changed.
Smart Meter Installation and the Heating Disruption Nobody Tells You About
What Smart Meters Do Differently
A smart meter communicates with your energy supplier, receives signals about pricing periods, and in some setups interacts with smart home devices. What gets far less attention is the transition period and what it means for homes with complex heating setups. The new device must be configured correctly for your tariff, property type, and wiring. If any part is wrong, your heating may not receive the signals it depends on.
The Two-Rate Problem
Many homes with storage heaters rely on a two-rate supply where electricity is cheaper overnight. An Economy 7 meter is the most common version. When a smart meter replaces it, the engineer must replicate the same two-rate structure on the new device, and this does not always happen. Sometimes the meter is set up as single-rate by mistake, switch times are wrong for the region, or the off-peak circuit stops activating entirely, leaving storage heaters cold and bills rising.
Economy 7 Meters, Smart Replacements, and the Off-Peak Heating Gap
How Economy 7 Actually Works
The Economy 7 meter controls which circuits receive power and when. Storage heaters connect to a circuit, activating during the off-peak window, usually midnight to seven in the morning, drawing cheap-rate electricity and storing it as heat in ceramic bricks for release throughout the day. A smart meter must replicate this through digital programming rather than physical switching, making correct configuration during changeover essential.
What Goes Wrong During the Changeover
The most common failure is the off-peak circuit losing its activation signal. The storage heaters are still wired correctly, but never charge. The problem is not immediately obvious because the bricks retain residual warmth for a day or two, by which point homeowners have bought plug-in heaters, paying daytime rates for electricity their storage heaters should have been using cheaply overnight.
Resolving the Economy 7 Changeover Issue
Contact your energy supplier rather than an electrician; it is almost always a configuration problem on their side. Ask them to confirm in writing that your meter is registered as a two-rate device and the off-peak switching times match your previous Economy 7 schedule. Ofgem has clear guidance on your rights if the supplier is slow to respond.
Storage Heaters and Smart Meters: A Complicated Relationship
Why Storage Heaters Are Particularly Vulnerable
Unlike an electric boiler that runs on demand, storage heaters are scheduled devices assuming a reliable off-peak charging window every night. Their operation depends on receiving power at the right time and rate, making them among the first to show meter compatibility problems.
Smart meters activate the off-peak circuit via a preprogrammed schedule or radio teleswitch signal. In older Economy 7 setups, this was a BBC Radio 4 longwave signal, now being phased out, and the transition to smart meter-based switching has not always been seamless.
The Radio Teleswitch Deadline
Properties relying on radio teleswitch receivers need them replaced or reprogrammed during installation. If this step is missed, the off-peak circuit stops working once the radio signal is discontinued. If your storage heaters have been unreliable since any recent meter work, raise this with your supplier.
Electric Boilers and the Meter Transition: Fault Codes and Power Interruptions
How Electric Boilers React to Supply Changes
An electric boiler depends on a stable supply and a control signal from a thermostat or programmer. The power interruption during meter installation can cause the boiler to reset or enter a fault state, and when power returns, it may display fault codes that are usually just its response to an unexpected power cut rather than a genuine fault.
Common Fault Codes and What to Do
The most common codes, low-pressure errors, communication faults, or lockout states, usually clear after a reset at the control panel. If they persist, check whether the thermostat has retained its settings, the heating schedule is active, and the boiler is receiving the correct voltage. If heating is still not working, call a heating engineer and explain that the problem started after the meter was changed.
If the heating does not return after a reset, it may help to compare the issue with common boiler fault codes after a power interruption, especially if the problem started immediately after the meter was changed.
Smart Thermostats and Heating Schedule Resets
The Problem of Lost Programming
A power interruption can cause the thermostat to lose its locally stored schedule or revert to factory defaults, even if the app retains the settings. The heating may appear to work but run on the wrong pattern, either constantly or not at all, during expected times. Check your thermostat schedule immediately after any meter installation, and if you use a multi-zone system, check each zone separately.
Compatibility Between New Meters and Smart Controls
Some smart thermostats use demand-side response technology, receiving signals from the grid to shift heating load, which requires pairing with a compatible meter. If your thermostat used to adjust automatically based on energy prices and no longer does so, the pairing may need reconfiguring through your supplier or the thermostat manufacturer.
Higher Energy Bills After Smart Meter Installation: Why It Happens
Three Reasons Bills Can Rise
First, the previous meter may have been running slowly; the new one records actual consumption for the first time. Not a billing error, even if it feels like one.
Second, the tariff may not have been configured correctly. If you were on Economy 7 and the smart meter is not recording overnight usage at the off-peak rate, you may be paying the daytime rate for all consumption, including storage heater charging, a high cost in winter.
Third, if the heating disruption caused you to use plug-in heaters or electric blankets, that supplemental usage will appear as increased consumption.
What to Do
Ask your supplier for a written tariff check confirming your overnight usage rate. Monitor daily usage via the in-home display to build a baseline. If there is a billing error, Ofgem guidance entitles you to a refund going back twelve months.
Meter Compatibility Problems: When the New Meter Does Not Suit Your Home
The two main smart meter standards are SMETS1 and SMETS2. SMETS1 meters caused widespread problems when homeowners switched suppliers, with smart features going offline. SMETS2 handles supplier changes better, but still requires certain conditions to function correctly.
Properties with poor signal may find smart functionality intermittent, the meter cannot send readings automatically, the in-home display may not update, and time-of-use switching may not work. For homes with older consumer units, non-standard wiring, or off-peak heating, installation can also expose pre-existing issues.
If you have storage heaters, an electric boiler, or any off-peak heating, contact your supplier before installation and ask how the new meter will handle your off-peak circuit, whether radio teleswitch equipment needs replacing, and who is responsible for verifying the configuration afterwards.
Power Supply Interruptions During Installation and Their Lasting Effects
Installing a new meter requires cutting power, sometimes for thirty minutes or more. Electric boilers may enter fault states. Heating programmers reset their clocks. Smart thermostats may lose local settings. Motorised valves may default to an incorrect position.
If power is cut and restored more than once during testing, these effects can compound; a boiler that seems fine immediately may develop an intermittent fault hours later.
Reset the boiler if it shows fault codes once the engineer leaves, reprogram the thermostat, and verify the following morning that storage heaters are charged overnight. If heating is not working within the first week, contact your supplier immediately.
If your home has no heating or hot water after a meter change, check the boiler, thermostat schedule, and storage heater charging pattern before assuming the new meter is working correctly.
Preventative Steps Before and After Your Meter Is Replaced
Before installation: Ask what type of meter is being installed and how it handles your existing tariff. If on Economy 7, ask about off-peak circuit compatibility and whether radio teleswitch equipment needs replacing. Photograph your meter, wiring, and thermostat settings beforehand.
During installation: Ask the engineer to confirm the off-peak circuit has been configured and any radio teleswitch equipment assessed. If you have an electric boiler, ask whether any steps are needed after power is restored.
After installation: Check your heating the same evening and the following morning. Verify the in-home display distinguishes between peak and off-peak usage. Report anything wrong within 24 hours and keep a written record of all contact.
When to Call a Qualified Electrician
Not every meter-related heating problem is the supplier’s responsibility. If your wiring or consumer unit has pre-existing issues, a meter installation can make those visible without causing them. If the supplier confirms correct configuration but heating still fails, call an electrician experienced in electric heating systems and give them a clear timeline showing the problem started after the meter was changed.
Conclusion
A new electric meter is supposed to be an improvement, and for most homes it is. But for properties with storage heaters, electric boilers, Economy 7 tariffs, or off-peak heating, the changeover can trigger problems nobody warned you about.
The harm of having a new electric meter installed incorrectly ranges from a reset thermostat schedule to weeks of storage heaters failing to charge, persistent boiler fault codes, and higher bills from a misconfigured tariff. All of these have clear causes and solutions; the key is knowing what to look for, raising issues quickly, and not accepting vague reassurances when your house is getting colder and your bills are going up.
If you are due a smart meter installation, prepare before the engineer arrives. If you have already had one fitted and your heating has not been right since, use this guide to identify what went wrong and contact your supplier with specifics. You have rights under Ofgem’s framework, and a supplier that installs a meter incorrectly must put it right.
Frequently Asked Questions
Can a new smart meter stop my storage heaters from working?
Yes. If the off-peak settings are wrong or not activated, storage heaters won’t charge. Ask your supplier to check the off-peak configuration.
Why is my electric boiler showing fault codes after the meter change?
Usually due to a power interruption, causing a reset or lockout. Try resetting the boiler; if it continues, get a heating engineer to check it.
Will my energy bills go up after smart meter installation?
They might if your tariff is set incorrectly or you’re now being charged peak rates for off-peak usage. Ask your supplier to confirm your tariff.
My smart thermostat lost its schedule after the meter change. Is this normal?
Yes, it can happen after power cuts. Reprogram it via the app or device settings.
What are my rights if heating is disrupted?
Your supplier must fix the issue at no cost and correct billing errors. If unresolved in 8 weeks, you can escalate to the Energy Ombudsman.