Advanced options
What The Heated Towel Rail Cost Calculator Works Out
- Running cost: rail wattage x hours on per day x 365, divided by 1,000 for kilowatt-hours, multiplied by your unit rate. The rate defaults to the current Ofgem price cap unit rate (26.32p per kWh from October 2026). A standard 150W rail for eight hours a day is 438 kWh and about GBP 115 a year at that rate; left on around the clock it is 1,314 kWh and GBP 345 or more, more than a fridge-freezer.
- On a timer instead: the same rail running two hours a day, bracketing the household's shower window, and the saving against your current hours. Towels dry in one to two heated hours; everything beyond that heats the bathroom, badly.
- The quiet 24/7 trap: the rail has no dial, no noise and no monthly reckoning, so a chrome accessory quietly becomes one of the house's larger appliances. Tall 450W ladder rails triple the standard figure.
- Custom wattage (advanced): enter the rating from the rail's label or element if it is not one of the four sizes offered. Electric rails run from about 60W to 1,000W.
- Thermostat duty cycle (advanced): the share of switched-on time the element actually draws power. A plain on/off element is 100%; a thermostatic element holding a set temperature typically cycles 40% to 70%, which is the correct answer where the rail doubles as the bathroom's heating.
- Months of the year and number of rails (advanced): many households switch the rail off in laundry-line season, so eight or nine months is realistic; several bathrooms multiply the total.
- Timer hours to compare (advanced): change the two-hour default to the hours your shower routine actually needs; the timer card and payback follow.
- Per day and per month (advanced): the daily kilowatt-hours and cost, with the hourly rate, and the cost in a month the rail is on.
- Plug timer payback (advanced): how many days a GBP 10 plug timer takes to pay for itself from the saving against your current hours. Usually a week or two for an always-on rail.
- Same heat from a plumbed rail (advanced): the same kilowatt-hours delivered by a central-heating rail on gas at the current price cap rate through a 90% efficient boiler. Gas-pence against electricity-pounds is why the electric rail's true constituency is heating-off summers, en-suites beyond the pipework and rental installations.