Also, many modern detergents are formulated for coldfill—they contain enzymes that activate at specific temperatures. Hotfill won’t break them, but if your hot water is too hot (say, 65°C+), you could denature those enzymes before the cycle even starts. Coldfill won because it’s foolproof. But as homes become smarter, with heat pumps, solar thermal, and real-time energy pricing, the machine à laver hotfill is no longer a retro oddity. It’s a logical choice for the energy-conscious. Some new heat pump dryers are even being designed to recover waste heat to pre-heat the next wash’s water.
Even on a 30°C eco cycle, a clever hotfill machine could draw cold water if the incoming hot is too warm. But if your solar thermal panels have been baking all afternoon, that 30°C comes free from the sun. Hotfill only works if your hot water is delivered quickly and at a usable temperature. If your boiler is across the house, the first litres of water will be cold as the pipe purges. You’d waste water and energy waiting for heat to arrive. That’s why hotfill machines are most popular in countries like Germany and Switzerland, where homes often have recirculating hot water loops or compact combi-boilers near the utility room. machine a laver hotfill
And if you’re renovating your laundry room? Maybe run that hot pipe after all. Your future self, washing sheets on a sunny winter afternoon, will thank you. But as homes become smarter, with heat pumps,
Imagine you have a modern condensing boiler (gas or heat pump), solar thermal panels on your roof, or a well-insulated hot water tank. Heating water centrally is often much cheaper per kWh than using electricity at peak rates. In many European homes, gas is a third the price of electricity. If your washing machine pulls hot water directly from the tank, it’s not using its 2kW heating element at all. Even on a 30°C eco cycle, a clever
So next time you hear “hotfill washing machine,” don’t think of a clunky 1980s relic. Think of it as the appliance that remembers we used to heat water once and use it well — and now, with the right tech, we can do that again, cleaner and cheaper than ever.