Wool Duvet vs Electric Blanket: Which Keeps You Warmer for Less?

Which keeps you warmer for less? An electric blanket is the cheapest way to warm up a cold bed, but a wool duvet is the better way to stay warm all night. At 100 W, pre-warming your bed for 30 minutes costs about 1 cent in the Netherlands and 2 cents in Germany, so on running costs the blanket wins. The catch is that consumer guidance says to switch it off before you fall asleep, so its warmth fades, while a wool duvet keeps holding your own body heat with no cable, timer or wiring to check. Below we compare cost, warmth, safety and damp, then help you choose, including when it makes sense to use both.

Which is cheaper to run: a wool duvet or an electric blanket?

On running costs, the electric blanket wins, and it is not close. A wool duvet uses no electricity at all. Electric blankets typically draw 50 to 150 W, according to the Belgian consumer organisation Test-Aankoop. Taking 100 W as a middle figure, and average household electricity prices for the first half of 2026 of about 22.5 cents per kWh in the Netherlands and 41.7 cents in Germany (taxes included), the cost looks like this:

How you use it	Energy per night	Cost per night (NL / DE)	Cost per winter, 150 nights (NL / DE)
Pre-warm for 30 minutes	0.05 kWh	€0.01 / €0.02	about €1.70 / €3.10
On all night (8 hours)	0.8 kWh	€0.18 / €0.33	about €27 / €50

Illustrative figures for a 100 W blanket over about 150 winter nights (roughly November to March), using average H1 2026 household prices. Check your own tariff and your blanket's wattage.

Pre-warming costs pennies. Even leaving a blanket on all night is modest, although that is exactly what Dutch and Belgian guidance advises against (more on that below). The price you pay to buy one matters too: an electric blanket usually costs less than a good wool duvet, so in the first winter it tends to win on cash as well.

The fairer comparison is over several winters, and against what you would otherwise sleep under. An electric underblanket still needs a duvet on top, so you are really comparing “duvet plus blanket” with “one warmer duvet”. A wool duvet is a one-off purchase with no running cost and no wiring to inspect, whereas Dutch advice is to replace an electric blanket at the latest every seven years. And if your duvet keeps you warm, it is easier to keep the bedroom at the cooler 16 to 18°C that Test-Aankoop recommends, which we cover in our piece on why modern homes make it harder to sleep.

Which keeps you warmer through the whole night?

An electric blanket makes heat. A wool duvet keeps yours. That difference matters at 3 a.m. Test-Aankoop advises switching an electric blanket on 15 to 20 minutes before bed and off when you get in, unless the model is designed for overnight use and has a thermostat. The Dutch programme MAX Vandaag gives similar advice (about 30 minutes) and adds that a heated bed can make sleep more restless. Once the blanket is off, the bed cools gradually.

A wool duvet works the other way round: it traps air in and between the fibres and slows the loss of the heat your body is already making. A laboratory study commissioned by the industry body British Wool and carried out at Bangor University compared duvets of the same 10 to 10.5 tog. Wool had the lowest thermal conductivity (0.037 W/mK, against 0.045 for down, 0.049 for synthetic and 0.053 for feather and down), and in an eight-hour test the middle of the wool duvet stayed at about 22°C while the others sat at roughly 13.5 to 15°C. Two caveats: these were lab tests without people, and the research was funded by the wool industry. Treat it as a useful indicator, not proof of how you will sleep.

Texeler Multi Choice Wool Duvet 600 g/m2, the winter weight wool duvet

For a cold bedroom

Multi Choice Wool Duvet 600 g/m²

Texeler wool in the heaviest weight of the Multi Choice range: maximum winter warmth with no cable, no timer and nothing to switch off.

from €113View the duvet →

Is a wool duvet or an electric blanket safer?

A wool duvet has no electrical risk, because it has no wiring or heating element. That is its biggest practical advantage. A modern electric blanket can be used safely, but it comes with rules:

Look for the CE marking, the Class II (double insulation) symbol and independent certification such as GS or TÜV, says Test-Aankoop. Newer models have overheat cut-offs, older ones may not.
Check the wires and controller at the start and end of every season, and lay the blanket flat, because folds can damage the wiring.
Never use it on damp sheets. The Australian consumer group CHOICE also says never to combine one with a hot water bottle.
Test-Aankoop advises against use by babies, children, older people and people with disabilities or paralysis.
Damaged wiring or an old blanket can cause a short circuit, and MAX Vandaag advises replacing a blanket at the latest every seven years.

With wool, the only thing to get right is the weight, so you stay comfortable rather than too warm. Our duvet buying guide explains how to choose.

What about damp and sweating?

Under a duvet you create your own little climate of heat and moisture. Test-Aankoop recommends a bedroom humidity of 30 to 50% and warns against using an electric blanket on damp sheets.

Wool handles moisture differently. According to Woolmark, wool fibres can absorb up to 35% of their weight in moisture before feeling wet. In the British Wool lab tests, wool moved moisture through the duvet faster than synthetic, down or feather and down (up to 120% faster than synthetic at 50°C), and condensation formed inside the synthetic duvet. For anyone who wakes up clammy under a winter duvet, that matters. As before, this is industry-funded lab research, and comfort is personal.

Wool duvet vs electric blanket at a glance

	Electric blanket	Wool duvet
How it warms you	Makes heat from electricity	Holds your own body heat
Getting into a cold bed	Best: pre-warm for 15 to 30 minutes	Builds as your body warms it
Warm at 3 a.m.	Fades once switched off, unless built for overnight use	Keeps working all night
Running cost	About 1 to 2 cents a night to pre-warm	None
Cost to buy	Usually lower	Usually higher
Safety	Wiring to check, replace within about 7 years, not for babies, children or older people	No electrical risk
Damp	Never on damp sheets	Absorbs and releases moisture
Needs a socket	Yes	No

Which should you choose?

Choose a wool duvet if you want

warmth that lasts all night, without switching anything off
no cable, socket or wiring to worry about, which helps with children, older relatives and guests
a duvet that manages moisture as well as warmth

Choose an electric blanket if you want

the cheapest way to climb into a warm bed in a cold room
a low upfront cost, and you are happy to pre-warm and then switch off
to keep the duvet you already own

Use both if you like a warm bed and a warm night

The most common setup is an electric underblanket under the fitted sheet with a duvet on top, which Test-Aankoop describes as the arrangement that gives you the most choice of bedding. Pre-warm, switch off, and let a wool duvet hold the heat. Always follow your blanket's instructions.

If you go the wool route, two things get you closer to what an electric blanket offers: warmth you can adjust, and warmth from below.

Warmth you can adjust

Satin ZipSet Wool Duvet

Two wool layers (250 g and 450 g) to use separately or zip together for 700 g, so you add or remove warmth as the weather changes.

from €319View the duvet →

Warmth from below, no cable

Wool Fleece Underblanket

A Texeler wool underblanket with a cashmere fleece finish that protects your mattress and adds warmth from below. It is not a heater, but it needs no socket.

from €193View the underblanket →

Warm all night, nothing to plug in

Texeler wool duvets come in several weights, from light summer layers to maximum-warmth winter ones.

Browse wool duvets →

Texeler wool bedding from Texel Island, available at WarmWool.

Frequently asked questions

How much does an electric blanket cost to run?

Very little. A 100 W blanket pre-warming for 30 minutes uses 0.05 kWh, about 1 cent in the Netherlands and 2 cents in Germany at average H1 2026 household prices. Left on for eight hours it uses 0.8 kWh, roughly 18 cents in the Netherlands and 33 cents in Germany, but that is not how consumer guidance says to use it. Test-Aankoop gives a typical range of 50 to 150 W.

Is it safe to leave an electric blanket on all night?

Test-Aankoop advises against it unless the product is designed for overnight use and has a working thermostat. The usual advice is to switch it on 15 to 20 minutes before bed and off when you get in. Follow your model's instructions, and check the wiring at the start and end of each season.

Can I use an electric blanket with a wool duvet?

Generally yes, if it is an electric underblanket under your fitted sheet with the duvet on top, which is the standard setup. Check your blanket's manual first, and never combine an electric blanket with a hot water bottle.

Is a wool duvet warm enough for a cold bedroom?

Choose the weight to match the room. In our Multi Choice range, 600 g/m² is the winter weight with maximum warmth, and a ZipSet lets you add or remove a layer. Our all-seasons duvet guide explains when a two-layer system is worth it.

What is the best bedroom temperature for sleeping?

Test-Aankoop recommends 16 to 18°C with 30 to 50% humidity, while the Sleep Foundation gives a wider range of about 15.6 to 20°C. Within that range, pick what feels right for you and keep your bedding comfortable.

Sources

This article is for general information and is not safety or medical advice. Always follow the manufacturer's instructions for any electric blanket, and speak to your GP if you have persistent sleep problems.