medisana HU 665 heated underblanket: 60 watts, and your own tariff decides the seasonal cost

Separate the two products first: an onderdeken is a heated pad laid under the sheet with you lying on top of it, while a bovendeken is the blanket that goes over you. This is the former, and the official specification lists 60 W, polyester, machine washable, with a 1,5 metre cord. Wattage is the only specification that really matters here, because it sets both how quickly the bed warms and what a season costs. Sixty watts is roughly an old incandescent bulb, nowhere near a 2000 W electric heater: that heater burns two kilowatt-hours in an hour, while this needs more than sixteen hours to reach one.

Here is the sum, without finishing it for you. Divide 60 by 1000 to get 0,06, multiply by the hours you actually run it each night, multiply by the number of nights in your heating season, then multiply by the price per kilowatt-hour on your own contract. All three variables are yours alone, the tariff most of all, because Dutch contracts differ enough that someone else's answer tells you nothing. As a way in: preheating for half an hour across a hundred and fifty nights is 0,06 times 0,5 times 150. The real saving lives in the same formula, since shortening the hours beats hunting for a more efficient device.

Whether to buy it depends on what it displaces. It cannot heat a room, and it does nothing for damp, wardrobes or the rest of the flat. What it can displace is the habit of pushing the thermostat up a degree or two purely so the bed feels tolerable. That makes the comparison not another heated pad but the gas behind those one or two degrees, a number printed on your annual statement. One honest note: the merchant page shows no struck-through former price, so this is simply the current price rather than a discount.Source 1

• It is an onderdeken, laid under the sheet rather than over the sleeper.
• Official specification: 60 W, polyester, machine washable, 1,5 metre cord.
• Three heat settings, and preheating is the cheapest way to use it.
• The merchant page shows a 4.2 average across 959 published reviews, a deep sample for this bracket.
• No struck-through former price appears, so the price is not a discount.
• The right comparison is the gas behind one or two thermostat degrees, not a rival pad.

Hokimi field note: preheat on the high setting, then drop to the lowest or switch off at bedtime; it saves power and stops you waking up too warm.

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Price29,99 euro (bol.com listed price on the day, no struck-through figure shown)Rating4.2 stars from 959 reviews. Specs60 W・polyester・machine washable・1,5 m cord・three heat settingsPlatformbol.com (this page carries an affiliate link)Checked1 September 2026