Heat pumps with underfloor heating in Ibiza

Why does underfloor heating suit a heat pump so well?

A heat pump is more efficient the lower the water temperature it has to produce. Underfloor heating warms a large surface, so lukewarm water is enough. Standard radiators need much hotter water to give the same heat.

How does the floor cool in summer?

With a reversible unit, the heat pump sends cool water through the same circuit. The floor absorbs heat from the room and the water carries it back to the outdoor unit.

It is a gentle, silent coolness with no draughts. It has two limits:

• It does not remove humidity. In the island's humid summers, comfort improves a lot with fan coils or a dehumidifier.
• Dew point. The water cannot get so cold that the floor condenses. The control prevents this with temperature and humidity sensors.

What does an underfloor heating system need?

1. Insulation under the pipes, so heat goes up and not into the slab.
2. Pipe (usually cross-linked polyethylene or multilayer) laid in circuits.
3. Screed covering the pipe and spreading the heat.
4. Manifold with one circuit per zone and balanced flow rates.
5. Thermostats per room or zone, plus an outdoor sensor that adjusts the water temperature to the weather.

Can it be installed in a renovation?

Yes, although each case needs studying:

• Available height: renovation systems are thinner but still raise the floor by a few centimetres.
• Doors and steps: doors may need trimming or the first step adjusting.
• Floor slab: we check it can take the weight of the screed.
• Floor finish: if it is being replaced, choose one suitable for underfloor heating.

Which floor finish should you choose?