One unit cools your home, heats it and gives you hot water

The technical trick of the third pipe

Why three pipes and not two — plain English

A conventional 2-pipe heat pump does one thing at a time: either cools your home, or heats it, or heats the DHW. When DHW is demanded while cooling, it has to stop the refrigeration cycle, switch the cycle valve and start the DHW production from scratch — burning more electricity.

The Daitsu Multi-Hybrid is a heat pump with heat recovery. It's a hybrid air-to-water + air-to-air system: a single AOHD outdoor unit feeds at the same time —

• the hydraulic module (Hidrobox or Aquabox AIHD), which handles the water side: DHW in the Aquatank cylinder, underfloor heating or Jaga low-temperature radiators, and
• the direct-expansion indoor units — wall, cassette, ducted, floor or ceiling — which handle the air side, behaving as a variable-refrigerant-flow system with heat recovery room by room.

The trick is the heat recovery: while cooling your home in summer, the extracted heat is diverted to the DHW tank instead of being dumped outside through the outdoor fan. Result:

1. It extracts heat from inside your home (that's what any AC unit does).
2. It recovers that heat and sends it via the hydraulic module to the DHW tank.
3. It heats your DHW at no extra electrical cost, because that heat is already being extracted from the house. Per the official Daitsu technical sheet, the system COP reaches up to 4.24 (AOHD 40 model, 12 kW; AOHD 45 and 54 reach 4.02 and 3.96 respectively). A performance very hard to match in conventional domestic HVAC, because you're reusing the same electrical energy twice.

In winter it works as a standard heat pump: extracts heat from the outdoor air and warms your home at very low electrical consumption. According to the official Daitsu datasheet it operates from -15 °C to +24 °C in heating, from -5 °C to +50 °C in cooling and from -15 °C to +43 °C when producing domestic hot water, with working temperatures of 55 °C for hot water and 52 °C for underfloor heating. It's CTE READY (compliant with the Spanish Building Code) and Smart Grid-ready, integrating naturally with your solar panels to push efficiency even further.

What you get

Lower bills, better comfort, fully legalised

• A single unit replaces the boiler, the water tank and the air conditioning. Less kit, less maintenance, less to go wrong.
• Lower bills: depending on previous consumption and insulation, typical reductions in HVAC + DHW sit between 30% and 50%. In summer, DHW is essentially free as a by-product of cooling.
• Stable comfort: underfloor heating or Jaga radiators give an even, quiet temperature. None of the boiler bangs of old.
• RITE legalisation: we hand over the certificate and technical report. Required for grants and mandatory for any significant intervention.
• Real grants: FACTOR 2026 call (up to 70% of the cost for individuals) + Palma IBI 100% × 6 years if your home is in Palma. See how the Palma IBI rebate works →

If you combine it with solar panels, the electricity that the heat pump uses comes from the sun — and the final bill in many of the homes we fit in Mallorca comes close to zero.