- May 9, 2026
- By Marvin
- Uncategorized
If you're in a London flat with electric heating, you might know the pattern already. The place feels warm enough in the morning, then by early evening the sitting room is cold, someone reaches for the boost button, and the next bill lands with numbers that don't seem to match how you lived.
That usually means one of three things. The heater is being used incorrectly, the Economy 7 setup isn't switching when it should, or the property has reached the point where the old system no longer suits the way people live. In older flats, ex-council homes, and all-electric rentals, I see all three.
An economy seven heater can still work well in the right property. It can also be a costly nuisance if the controls are misunderstood, the meter timing is wrong, or someone has swapped heaters without dealing with the dedicated off-peak wiring properly.
Table of Contents
- Your Guide to Economy 7 Heaters in London
- How Economy 7 and Storage Heaters Work
- The True Cost of Economy 7 Heating
- Operating Your Storage Heater Correctly
- Upgrading or Replacing Your Economy 7 System
- Safety, Maintenance, and Landlord Compliance
- Your Economy 7 Questions Answered
Your Guide to Economy 7 Heaters in London
Economy 7 still turns up all over London. It’s common in flats without gas, older local authority housing, and period conversions where electric heating was added years ago because it was simpler than running pipework. Many of those homes still have old storage heaters on the wall, a separate off-peak circuit, and a tenant or owner trying to work out why the home is chilly by tea time.
The confusion starts with the name. People often call the whole setup an economy seven heater, but the heater and the tariff are two different things. One stores heat. The other decides when electricity is cheaper. If either part is wrong, comfort and running costs both suffer.
For homeowners, the primary question is usually whether to keep the system and use it properly, modernise it, or replace it. For landlords, there’s another layer. You also need to think about electrical safety, EICR observations, meter arrangements, and whether the existing heating suits the property well enough to avoid repeat complaints.
What tends to go wrong in London properties
- Evening heat runs out: Older storage heaters often dump too much warmth earlier in the day, especially in draughty flats.
- Bills become unpredictable: A mis-set timer, boost use, or a day-rate heater on the wrong circuit can push costs up fast.
- Replacement gets botched: Someone swaps a storage heater for a standard panel heater but leaves the tariff and off-peak wiring arrangement untouched.
- Compliance gets ignored: Ageing circuits, tired isolators, and faulty controls often show up during inspections.
Practical rule: Don’t judge an Economy 7 setup by the heater alone. The tariff, the meter, the controls, the wiring, and the property’s heat loss all matter.
If you’re dealing with faults, a rewire, or a heating upgrade in an all-electric home, it helps to have a home electrician in London who understands off-peak circuits rather than treating it like a normal socket job.
How Economy 7 and Storage Heaters Work
You get called to a cold flat in January, the heaters are hot in the morning, useless by evening, and the tenant says Economy 7 “doesn’t work”. In London, that usually means the tariff, meter timing, heater controls, and property heat loss are out of step, not that the whole idea is faulty.
Economy 7 is a time-of-use tariff. It gives you seven cheaper off-peak hours overnight and a higher day rate outside that window. It was built for homes that can shift heavy electricity use into the night, especially all-electric properties with storage heaters and sometimes an immersion heater, as outlined in the Economy 7 overview.
The meter arrangement matters as much as the heater. Many older flats still have separate off-peak supplies, contactors, or legacy switching gear that energises the heating circuit only during the cheap period. If the meter times are wrong, the switching has failed, or a replacement heater has been connected to the wrong circuit, the system still heats. It just heats at the wrong price.
A working setup usually depends on four parts:
- Dual-rate metering that records day and night use separately
- Off-peak switching that supplies the heating circuit during the cheap hours
- Storage heater controls that determine how much heat the unit stores
- Room-by-room use that matches the heater’s release pattern to when people are home
The heater itself stores heat in dense internal bricks overnight and releases it gradually through the day. Older units do this with basic input and output controls, plus vents or dampers. Newer high-heat-retention models hold onto warmth better and give you finer control, which is one reason they suit London flats far better than many of the old boxy units still hanging on in ex-council stock and converted houses.
The trade-off is simple. Storage heaters are efficient at using off-peak electricity, but they are not responsive in the way gas central heating or modern direct-acting electric heaters are. If the flat loses heat quickly, or the occupant needs most of the warmth late in the day, an older storage heater can feel badly timed even when it is technically working as designed.
I see this a lot in converted Victorian properties. The front room heats up by late morning, the occupant is out all day, and by 7pm the useful heat has already drifted away through old windows, suspended floors, or uninsulated walls. In that case, the problem is rarely just “the heater”. It is the heater, the fabric of the building, and the occupant’s routine.
That is also why casual swaps cause trouble. Replacing a storage heater with a standard panel heater may look straightforward, but it changes the load profile, the tariff value, and sometimes the circuit arrangement. Before doing that, it is worth checking the likely electrician hourly rates in London against the longer-term running cost of keeping the wrong heating setup.
Good operation starts with the basics. The heater should charge on the cheap rate, hold enough warmth for the room, and release it at the right time. If any one of those three points fails, bills rise or comfort drops. Often both.
There is also a practical insulation point here. Better draught-proofing, sensible curtain use, and reducing uncontrolled heat loss can make an older Economy 7 system far more usable, which is why general Superior Home Improvement winterizing advice is relevant before condemning the heaters outright. In London rentals, that matters because repeated complaints about cold rooms often start as a heating issue and end up exposing a wider property condition problem.
Older storage heaters are blunt instruments. They can still do a decent job in the right flat, with the right tariff and correct settings. But they only work well when the meter, controls, wiring, and building all support the way the occupant lives.
The True Cost of Economy 7 Heating
The cheapest night rate in the world won’t rescue a badly used system. Economy 7 only pays off when the property uses enough electricity during the off-peak window. If most of your electricity use happens in the daytime, the higher day rate can cancel out the benefit.
The main test is simple. According to guidance cited by Infrared Group, Economy 7 is only cost-effective if more than 40 per cent of total electricity consumption occurs during the seven-hour off-peak period, which usually means homes using electricity for heating and hot water, while also shifting other appliance use overnight. That benchmark appears in their Economy 7 guide.
When the tariff works
In practice, Economy 7 suits people whose home and routine fit the tariff. That often includes all-electric flats with storage heaters, an immersion heater set correctly, and occupants willing to run some appliances at night.
It tends to work less well when people expect on-demand heat like gas central heating, work unusual hours, or use portable heaters and boost functions in the evening. Once that starts, the supposed saving can disappear.
Here’s the honest trade-off.
| Heating setup | Estimated annual cost |
|---|---|
| Economy 7 storage heaters in a well-matched all-electric property | Varies by tariff, usage pattern, heater condition, and whether off-peak use exceeds the 40 per cent benchmark |
| Modern smart electric radiators on a standard tariff | Often simpler to control, but running cost depends heavily on insulation and how many hours they’re used |
| Gas central heating | Often easier for comfort and timing, but depends on gas access, boiler condition, controls, and the property itself |
I haven’t filled that table with invented numbers because that would mislead you. Annual heating cost depends on tariff, insulation, occupancy, meter setup, and whether the heaters are charging off-peak. In London flats, those variables are too important to gloss over.
A practical comparison for a London flat
What I can say with confidence is this:
- Economy 7 can be good value when the home is fully electric and much of the consumption is pushed into the cheaper night window.
- Standard electric panel heaters can feel better day to day because they respond when you ask them to, but they can be expensive if used heavily.
- Gas central heating usually wins on convenience where gas is available, but many London flats don’t have that option.
If you’re trying to cut waste before changing the whole system, broad home measures still matter. Draughts, poor curtains, and heat loss can make any heating system feel expensive. Some of the general ideas in Superior Home Improvement winterizing advice are useful because they focus on reducing heat loss first, which helps whether you keep Economy 7 or replace it.
For budgeting electrical work around a tariff change or heater upgrade, it’s also worth understanding how much electricians charge per hour in London, because the labour side is often overlooked until the quote arrives.
Operating Your Storage Heater Correctly
A common London callout goes like this. The heater was on all night, the flat felt warm at 7am, and by 4pm the sitting room was cold. In most cases, the fault is not the tariff. It is the way the storage heater has been set.
Older units are simple, but they still catch people out. You are making two decisions: how much heat to store overnight, and how fast to release it during the day. Get either one wrong and the heater will feel wasteful, even if it is working as designed.
What the controls do
The Input control sets how much heat the unit stores during the off-peak period. In colder weather, it usually needs to be higher. In milder weather, or in a small well-insulated room, it often needs to be lower.
The Output control governs how quickly that stored heat comes into the room. On many older heaters, this works through vents or dampers. Leave the output too far open overnight and the heat leaks out before you need it. I see this regularly in London flats where occupants assume a higher setting on every dial means more comfort. It often means a warm morning and a cold evening.
Keep the output low during the charging period. If heat escapes overnight, you have paid for warmth at the wrong time.
A routine that works better
With older storage heaters, a simple routine is usually better than constant fiddling:
- In the evening: Set the input based on the forecast, the season, and how much stored heat was left that day.
- Overnight: Keep the output low so the heater charges and holds the heat.
- In the morning: Open the output only enough to take the chill off the room.
- During the day: Turn the output back down if the room is empty or gets good sun.
- In the evening: Check what is left. If the heater is always running out early, the input may be too low, the heater may be too small for the room, or the flat may be losing heat through draughts, poor glazing, or uninsulated walls.
That last point matters in older London conversions. A heater can be in full working order and still leave the room cold because the property sheds heat faster than the unit can release it sensibly.
Common mistakes that raise the bill
- Using boost as normal heating: Boost or convector functions use peak-rate electricity on many setups, so they are usually the expensive part.
- Leaving the output wide open all day: The room heats quickly, then the stored heat is gone before late afternoon.
- Running every heater the same way: A hallway, bedroom, and living room have different use patterns.
- Copying settings from another flat: The top-floor tenant, the ground-floor tenant, and the neighbour in a better-insulated block will not get the same result.
If you want tighter control, newer heaters and programmable controls can improve comfort, especially in properties with mixed occupancy patterns or short-let use. For landlords and owners modernising an all-electric flat, smart home installation options for heating control can make daily use simpler without changing the whole heating system at once.
Upgrading or Replacing Your Economy 7 System
There comes a point where fiddling with dials stops being the answer. If the heaters are old, parts are failing, and the flat still feels wrong, the sensible move is to decide whether you’re upgrading the existing idea or abandoning it.
When an upgrade makes sense
If the property is all-electric and the tariff still suits the way the occupants live, replacing tired legacy units with modern high-heat-retention storage heaters can be a logical step. These newer units are better insulated, easier to programme, and generally better at holding heat until you want it.
They’re still storage heaters, though. That matters. They improve control and comfort, but they don’t change the basic logic of charging overnight and releasing heat later.
This route usually makes sense when:
- The off-peak setup is sound: Metering and dedicated heating circuits are in place and working.
- The home is committed to electric heating: There’s no realistic gas option.
- The user pattern suits storage: Occupants can still benefit from off-peak charging.
- The main complaint is old equipment: Not the tariff itself.
When replacement is the better move
Sometimes the main issue isn’t the age of the heater. It’s that the property no longer suits storage heating at all. A flat occupied mostly in the evenings, or a home where people want room-by-room responsive control, may be better with modern direct-acting electric heating on a different tariff.
That’s where people get caught out. Switching from Economy 7 isn’t just a matter of unscrewing one heater and hanging another on the wall. As explained in Fischer’s guide to the subject, homes often have separate off-peak-only heating circuits, and a proper change can require consumer unit changes and other electrical work to meet BS 7671, with overall costs running into thousands in some cases. That warning appears in their piece on switching away from Economy 7.
The expensive mistake is replacing a storage heater with a normal panel heater but leaving it on the wrong tariff or circuit. The heater may work, but the running cost won’t be what you expected.
In London flats, I’d expect an electrician to inspect all of this before quoting properly:
- Circuit arrangement: Is the heater fed from an off-peak board, a relay-controlled circuit, or a mixed arrangement?
- Consumer unit capacity: Can the existing setup support the new design safely?
- Cable routes: Will replacement need chasing, trunking, or floor access?
- Meter and tariff implications: Does the supplier side need changing before the electrical side makes sense?
Smart meters and newer tariffs
A lot of owners assume Economy 7 is old technology and therefore incompatible with anything modern. That isn’t necessarily true. Dual-rate setups can still work with modern metering, and some homes now look beyond traditional E7 toward more flexible time-of-use tariffs.
That can be useful if the property also has other overnight loads, such as hot water, EV charging, or battery charging. But the right answer depends on how the home uses power as a whole, not just what heater is on the wall.
The practical order is simple. First assess the wiring and tariff setup. Then decide whether to upgrade the heaters, redesign the heating, or change both together.
Safety, Maintenance, and Landlord Compliance
Old Economy 7 systems often look simple from the outside. Behind the cover plates, they can be anything but. Separate off-peak circuits, ageing isolators, legacy meter arrangements, and old heater connections all deserve proper inspection.
Cost and safety overlap. A heater that charges at the wrong time isn’t just frustrating. It can point to a control fault, a relay issue, a timer problem, or poor previous work.
What an electrician checks on an E7 system
A proper inspection goes beyond seeing whether the heater gets warm. During fault-finding on Economy 7 systems, electricians need to test the accuracy of the E7 clock or meter relay, because desynchronised timers are a common cause of high bills. The same guidance also notes that upgrading immersion heater controllers and checking that thermostats cut off correctly are important safety actions during an EICR to prevent overheating and support BS 7671 compliance, as described in this Pro Certs explanation of Economy 7 immersion systems.
In practice, that means checking things such as:
- Time switching: Is the off-peak circuit energising when it should?
- Heater terminations: Are the connections sound, with no signs of overheating?
- Local isolation: Can each heater be safely isolated for maintenance?
- Immersion control: Is hot water charging correctly and cutting out properly?
- Circuit condition: Are protective devices, cabling, and earthing arrangements up to scratch?
A high bill and a cold room often point to the same root problem. The system isn’t switching or controlling correctly.
What landlords need to stay on top of
For landlords, the heating arrangement forms part of the wider electrical installation. If the property relies on storage heaters, the condition of those circuits matters just as much as the lighting or socket circuits.
A sensible landlord approach includes:
- Regular EICRs: Older all-electric rentals deserve careful inspection, especially where storage heaters and immersion heaters are involved.
- Prompt repair of controls: Faulty timers, thermostats, and relay issues shouldn’t be left for the next void period.
- Clear tenant handover: If the tenant doesn’t understand input and output controls, they’re more likely to misuse the system and complain that it “doesn’t work”.
- Portable heater oversight: If tenants are relying on plug-in heaters because the main system isn’t performing, that should trigger a wider review.
In London rentals, I’d also treat repeated “no heating in the evening” complaints as a technical issue until proven otherwise. Sometimes it is user error. Sometimes it’s a worn-out heater. Sometimes the tariff side and the wiring side are out of sync.
When maintenance is no longer enough
There’s a limit to what servicing can fix. If the property has ageing storage heaters, tenant dissatisfaction, and recurring EICR observations linked to old heating circuits, replacement may be the more responsible decision.
That doesn’t mean every Economy 7 property needs ripping out. It means the installation should be judged on condition, safety, suitability, and actual use, not nostalgia for how the system was meant to work decades ago.
Your Economy 7 Questions Answered
Can I keep Economy 7 with a smart meter
Usually, yes. A common myth is that smart meters and Economy 7 don’t mix. In reality, most modern smart meters can support dual-rate tariffs, and newer time-of-use products can offer more flexibility than a fixed old-style setup, as explained in Brimstone Energy’s piece on Economy 7 smart meter misconceptions.
What matters is the supplier setup, the meter programming, and whether your heating circuits are arranged in a way that still makes sense.
Could an old storage heater contain asbestos
Some very old electric heating products in the UK can raise asbestos concerns, especially where age and original components are unknown. Don’t open the casing yourself, don’t drill into it casually, and don’t assume. If the unit is very old and you’re planning removal, ask for professional advice before any disturbance takes place.
Why are peak-time appliances such a problem
Because Economy 7 only makes sense when a large share of use happens overnight. If you run tumble dryers, portable heaters, or immersion boost during the expensive part of the day, you weaken the whole tariff advantage. That’s often why people feel they’re on a “cheap night tariff” while still getting stung.
Should I replace the heaters or just change tariff
That depends on the wiring, the tariff, and how you live. If the home still suits off-peak charging, upgrading the heaters may be enough. If the home needs on-demand heat and better room-by-room control, replacement and tariff review may be the better route. The wrong way to do it is changing one part and ignoring the rest.
Why is my living room cold by evening
Common reasons include poor output control, too little overnight charge, heat loss from the room, or a heater that’s too old to hold warmth well anymore. If you’re confident the settings are right, it’s time to get the system checked properly.
If you need faults traced, an EICR on an all-electric property, or a proper assessment before replacing an economy seven heater, Electricians London 247 handles emergency callouts and planned electrical work across London. Their Part P-qualified team works to BS 7671 standards, can assess off-peak circuits, storage heater wiring, immersion controls, and consumer unit upgrades, and they also offer rapid estimate support by phone or WhatsApp for many jobs.