Warmer Bills began with a simple winter problem: a household bill was higher than expected, and one everyday electrical appliance turned out to be costing roughly four times what had been assumed. The useful question was not whether the appliance was “efficient” or “expensive”, but how many watts it used, how long it ran, what electricity cost per kilowatt-hour at the time, and what those numbers meant in pounds.
Why Warmer Bills exists
I created Warmer Bills to answer that kind of question properly. The aim is to tell UK homeowners and long-term renters what their homes actually cost to run, using numbers that can be checked rather than vague claims about saving money.
If I publish a running-cost figure, I want the assumptions behind it to be visible. That means stating the relevant unit rate, showing when that rate applies and explaining the usage assumptions used in the calculation. A figure without that context can become misleading surprisingly quickly.
Daniel Whitfield
I write and run Warmer Bills. Running costs became worth investigating because apparently small differences in wattage, running time, heating demand and energy prices can produce meaningful differences over a day, month or winter. My job here is to turn those inputs into figures readers can understand and use when making decisions about their homes.
What I cover
Warmer Bills stays deliberately focused on six areas: Appliance Running Costs, Heating & Boilers, Insulation & Damp, Energy Bills & Tariffs, Solar & Home Batteries, and EV Charging at Home.
That includes questions such as what an appliance costs to run for an hour, how heating choices affect energy use, where insulation may reduce heat loss, how household tariff rates affect calculations, what solar generation and battery storage may mean for home energy use, and how much charging an electric vehicle at home can add to electricity consumption.
The common thread is practical household energy. Readers often arrive after receiving a high bill, during a cold spell or when an appliance has failed. They usually need a useful figure and enough context to make a decision, not a long discussion about the energy industry.
How I calculate running costs
For a straightforward electrical appliance calculation, I start with the appliance’s wattage. I divide the wattage by 1,000 to convert watts into kilowatts, multiply that figure by the number of hours the appliance is used, and then multiply the resulting kilowatt-hours by the relevant electricity unit rate.
For example, the basic calculation is: appliance wattage ÷ 1,000 × hours used × electricity unit rate. Where an appliance cycles on and off, changes power during operation or has several operating modes, the calculation needs additional assumptions rather than pretending that its maximum rated wattage represents constant consumption.
Unless a page clearly says otherwise, the default electricity unit rate I use comes from the current Ofgem price cap. The rate and the date used are stated because the price cap changes, and calculations that were reasonable under one cap period may need reviewing when a new rate takes effect.
The Warmer Bills rule: every cost claim should carry a number, a unit and a date, with the assumptions needed to understand how the figure was produced.
These calculations are estimates based on stated inputs. They are not a substitute for a reader’s meter reading. Actual consumption can vary with appliance behaviour, thermostat settings, property size, insulation, outdoor temperature, usage patterns, tariff structure and other household conditions.
What you will not find here
I do not publish energy-market news, Ofgem policy commentary, industry analysis or supplier switching tables. Warmer Bills is not designed to follow every announcement in the energy sector, and it does not provide individual advice on disputes between customers and energy suppliers.
I also avoid exaggerated headlines promising that a single change will “save £1,000 on your bills”. A saving figure is only useful when the starting point, usage, rate and calculation are clear. Where savings can reasonably be estimated, I prefer to show the assumptions and arithmetic so readers can judge whether those assumptions resemble their own homes.
Warmer Bills does not instruct readers to carry out gas or electrical work themselves where qualified professional work is required. Articles may explain how systems operate, what different options mean and what questions to ask, but safety-critical installation, servicing and repair work belongs with appropriately competent professionals.
Commercial relationships are treated in the same straightforward way. Sponsored material must be disclosed. The publication is not a generic deals site, and commercial involvement does not remove the need for useful, relevant information.
Why the dates matter
Energy-cost content ages faster than many household guides because unit rates change. I therefore date cost figures and review the arithmetic when the underlying rates change. An appliance’s wattage may remain the same, but the cost of running it for three hours can change when the electricity unit rate changes.
That is why Warmer Bills concentrates on transparent calculations rather than permanent-sounding claims. The objective is not to produce one impressive number. It is to give readers enough information to understand where the number came from and, when necessary, recalculate it using a different rate or usage pattern.
Work with Warmer Bills
I welcome relevant approaches from boiler manufacturers, insulation installers, solar and home-battery companies, smart-home brands, energy suppliers, EV-charging businesses and agencies with genuinely useful material for UK householders. Paid guest posts and sponsorship must fit the publication’s subject areas and remain clearly disclosed.