Economy 7 heating: the honest guide
Economy 7 gives you around seven hours of cheaper electricity overnight and a higher rate during the day. Whether it still makes sense depends entirely on how much of your usage you can shift into those hours — and most advice online skips that question entirely.
Is Economy 7 worth it for heating?
Economy 7 is worth it only if you can shift at least 40% of your electricity use into the off-peak window — typically with storage heaters, a hot water cylinder on a timer, and overnight appliance use. The off-peak rate is roughly 40–50% cheaper than the day rate, but the day rate is higher than a standard tariff. If you heat mostly during the day, a standard tariff with on-demand heating such as infrared panels is usually cheaper overall.
How Economy 7 actually works
Your meter records two rates: a cheap rate for roughly seven overnight hours (the exact window varies by region and supplier) and a day rate that is noticeably higher than a standard single-rate tariff. The classic setup pairs this with storage heaters that charge overnight and release heat through the day, plus a hot water cylinder on an off-peak timer.
The maths is simple but unforgiving. If most of your electricity is used during the day — cooking, working from home, topping up heating in the evening — the higher day rate can wipe out the overnight saving. Check your actual split before assuming the tariff is saving you money.
Economy 7 heaters versus the alternatives
Modern high-retention storage heaters are far better than the 1980s units most people picture: better insulation, controllable output and fan-assisted release. On a genuine off-peak rate they remain one of the cheapest ways to heat a well-insulated home all day.
The alternatives each have a case. Infrared panels heat rooms on demand at the standard rate, which suits homes occupied at irregular times — nothing is heated when a room is empty, and there is no overnight charging gamble. A heat pump delivers heat at two to three times the efficiency of any direct electric system but needs good insulation and a meaningful budget. Economy 7 radiators — oil-filled electric radiators marketed at Economy 7 users — are simply standard-rate heaters unless you can run them off-peak, which defeats their purpose.
When to leave Economy 7 — and when to stay
Leave if you have removed or plan to remove storage heating, work from home with heavy daytime usage, or cannot shift hot water heating off-peak. Stay if your home suits storage heating, your insulation is decent, and your off-peak share is genuinely above the break-even point — your supplier can tell you your actual split.
If you switch off the tariff, replace the heating at the same time. Running storage heaters on a standard tariff is the most expensive way to use them, and keeping Economy 7 without storage heaters usually means overpaying during the day.
A sensible shortlist
- Ask your supplier for your actual off-peak usage percentage before changing anything.
- Compare total annual cost on both tariffs, not just the overnight rate.
- If keeping storage heating, size modern high-retention units room by room.
- If leaving, plan the heating replacement and the tariff switch together.
- Confirm your consumer unit and wiring suit any new electric heating load.
- Use NICEIC or NAPIT registered electricians for heater replacement work.
Frequently asked questions
Reviewed by the Infrared Heat Solutions technical team · Last updated July 2026 · Data sources: Ofgem price cap, Energy Saving Trust, first-party running-cost model