Can a small fan under a radiator really help cut your heating costs? At first glance it sounds odd — after all, the fan itself uses electricity. In reality, though, it's not about "generating extra heat." The savings come from somewhere else: more efficient use of the heat you already have, a lower required flow temperature, faster room heat-up, and a more even temperature throughout the space.
You can't calculate the exact savings from an EITAN fan without knowing the specific house, flat, heating type, radiators, control settings and operating pattern involved.
EITAN delivers one kind of saving in a flat with district heating, another in a house with a gas boiler, and yet another with a heat pump. What matters is understanding the underlying principle: the EITAN fan doesn't break the law of conservation of energy. It simply helps the heat you're already paying for get used more efficiently, exactly where you need it — in the living space of the room.
It isn't that EITAN "makes heat for free." Its benefit is that you get more usable heat out of the radiator, faster, more evenly, and with lower demands on the heating system as a whole.
When we heat a home, we're not directly paying for the pleasant warmth in the middle of the room. We're paying for energy that first has to travel through the entire system:
The source might be a gas boiler, an electric boiler, a heat pump, or a district heat exchanger station. Every one of these runs at a certain efficiency. And for most systems, a simple rule applies: the higher the flow temperature you need, the worse the overall efficiency tends to be.
A higher water temperature also means greater heat loss along the way — in the pipes, in risers, in plant rooms, or anywhere else along the route where you don't actually need that heat.
If a room can be heated comfortably even at a lower flow temperature, the whole system can run more efficiently. And that's exactly where the EITAN fan comes in.
A radiator releases heat into a room through natural air movement and radiation. But natural convection tends to be slow. Warm air rises, some of the energy collects near the ceiling, and different parts of the room can end up at noticeably different temperatures.
The result is familiar to plenty of people in practice:
The EITAN under-radiator fan speeds this whole process up. It gently pushes air across the emitter, helping heat leave the radiator faster and reach the whole room sooner.
The radiator can then deliver more heat into the space in less time. That often makes it possible to reach the same comfort level at a lower flow temperature, or in a shorter heat-up period.
Flow temperature plays a central role in heating. The hotter the water a system has to prepare, the more energy that takes, and the greater the losses tend to be while distributing it.
Lowering the flow temperature can help especially with:
The EITAN fan increases a radiator's ability to deliver heat into the room. In practice, it works much like fitting a bigger radiator — just without demolition, draining the system, or any construction work.
One way to boost heating output in a room is to install a bigger radiator. But that usually means:
The EITAN fan offers a simpler route. It installs under the radiator and helps raise the efficiency of heat transfer, with no work on the heating system itself.
That's especially valuable where:
Savings aren't only about the numbers on your bill. Subjective thermal comfort plays a big role too.
When heat is unevenly distributed in a room, people tend to turn the thermostat up. It gets set higher because "it's still cold," even though some of that heat is already there — it just isn't where the person needs it.
EITAN supports air circulation and helps spread heat more evenly throughout the space. That can make a room feel more comfortable without unnecessary overheating.
In practice, that means:
The EITAN fan makes a lot of sense in rooms that aren't heated continuously. Typical examples include:
With intermittent heating, how quickly a room reaches a comfortable temperature matters a great deal. If heat-up takes a long time, the system runs hard, the radiators get hot, but comfort arrives late.
EITAN speeds up heat transfer from the radiator into the room, which can cut the heat-up time by anywhere from tens of minutes to a few hours — depending on the radiator type, heat source, room size and the heating system as a whole.
You might wonder: wouldn't an ordinary axial fan, like the ones used in computers, do the job just as well? In practice, the difference is significant.
A small axial fan has to spin at high speed to reach the output it needs. That usually means more noise and a narrow, fast jet of air. That jet only reaches a small part of the radiator and can feel unpleasant — sometimes it even feels like a cold draught.
EITAN is designed specifically for use with radiators. Its purpose isn't to create a strong draught, but a quiet, even flow of air along the emitter.
That's why convectors and air-conditioning units often rely on principles that move air more smoothly and pleasantly than an ordinary small axial fan.
The result is greater comfort, better use of the radiator's surface, and quiet operation suitable even for living spaces.
The main use for the EITAN fan is, of course, during the heating season — it helps heat a room faster and more evenly. But its usefulness doesn't stop when the heating season ends.
In summer, it can serve as a source of gentle, pleasant air movement. This isn't air conditioning — EITAN doesn't produce cooling. But it can keep the air in a room moving enough to make it feel more pleasant to be in.
Year-round, it can also help with drying laundry. Thanks to better air circulation, laundry can dry noticeably faster than in still air.
The EITAN under-radiator fan is especially suited to situations where you want to improve your existing heating's performance without construction work. It tends to deliver the biggest benefit in these situations:
The savings from an EITAN fan don't come from adding new heat to the room. They come from making better use of heat your system has already produced. The main mechanisms are:
The exact size of the saving always depends on the specific conditions. But the principle is clear: the better heat gets from the radiator into the room and to the people in it, the less energy you need to reach the same level of comfort.
The great advantage of the EITAN fan is its simplicity. It helps boost an existing radiator's output without replacing the emitter, without draining the system, and without any work on the heating installation itself.
That makes it a practical option for homes, holiday properties and any space where heating needs to improve quickly, cleanly and at minimal cost.
EITAN from Elsymco is a smart addition for anyone who doesn't just want to heat more — they want to heat more effectively.
Take a look at the EITAN under-radiator fan from Elsymco and see how it can help in your flat, house or holiday property.
