EUR 19.99, rated 4.4 from 262 reviews. The listing gives 420 watts and about ten minutes to 65 degrees, so a charge is 0.07 kilowatt-hours: multiply by your own price per unit. Two to four hours of warmth bare, eight to ten in the cover.
What you need to know
Dutch evenings start to cool in September while it is still too early to turn the heating on across the flat. The listing for the Coozie electric hot water bottle, model AquaTherm, prints two numbers, and together they are enough to work out the running cost yourself: 420 watts of power and about ten minutes to heat. That is 0.07 kilowatt-hours a charge, and the rest is just multiplying by the price per kilowatt-hour in your own contract. It costs 19.99 euro and is rated 4.4 from 262 reviews.
- Specification: 420 watts, about ten minutes to reach roughly 65 degrees, two to four hours of warmth without the cover and eight to ten hours with the supplied ThermoSoft cover. (source 1)
- Model AquaTherm, polyester, supplied with a charging base and cable and one hand-warmer cover; it is not refilled with water and the maker positions it as a replacement for the traditional bottle. (source 1)
- Priced at 19.99 euro, rated 4.4 from 262 reviews on the listing, and shown as in stock. (source 2)
- EAN 8721082221689. The indicator light going out is the only signal that it is ready; there is no temperature read-out. (source 1)
The sum is short: watts divided by 1000, times hours of heating, is kilowatt-hours per charge. 420 divided by 1000, times ten over sixty, is 0.07. Multiply by the kilowatt-hour price in your contract and you have the cost of one evening. To judge whether that is worth it, set it beside whatever you would otherwise have done: a 60-watt electric underblanket left on for eight hours draws 0.48 kilowatt-hours, roughly seven times as much, while two extra hours of central heating burns gas on a different bill entirely and is nowhere near 0.07 in scale.
The second number is how long one charge lasts, and the maker gives two: two to four hours without the cover, eight to ten with it. The cover is therefore not an accessory but half the insulation. Take it off and the same 0.07 kilowatt-hours lasts about a quarter as long. To get the upper figure the listing advertises, the cover has to stay on.
One thing the listing does not state is worth knowing first: there is no capacity in litres, no stated temperature limit for the outer material, and no temperature display, only an indicator light that goes out when it is ready. The heat it gives is a fixed 65 degrees or so and you cannot turn it down. For anyone sensitive to heat, or buying this for a child, that matters more than the price does.
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- Price
- 19.99 euro, shown in stock on the listing
- Rating
- 262 reviews averaging 4.4
- Specs
- 420 watts, about ten minutes to 65 degrees, two to four hours uncovered
- Platform
- bol.com, EAN 8721082221689
- Checked
- Listing read on 5 September 2026
Before ordering, confirm the current price, stock, size or specification, delivery and return terms with the source.
Why it may be useful
EUR 19.99, rated 4.4 from 262 reviews. The listing gives 420 watts and about ten minutes to 65 degrees, so a charge is 0.07 kilowatt-hours: multiply by your own price per unit. Two to four hours of warmth bare, eight to ten in the cover.
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