Daikin Multi+ with hot water
Up to 4 indoor units and a hot water tank with a single outdoor unit. Designed for homes up to 150 m² and households of up to 5 people.
Air conditioning with hot water from a single outdoor unit
More and more manufacturers combine a multi-split with a domestic hot water tank connected to the same outdoor unit. Here is how it works and who it suits.
How it works
A single outdoor unit feeds several indoor air-conditioning units (wall, cassette, ducted…) and also heats a hot water tank. All with heat pump technology.
In summer, the heat removed from the rooms while cooling is used to heat the water in the tank. According to manufacturers, hot water then comes with very little extra electricity use.
In winter, the heat pump can warm the rooms and the water. When demand is high, the system gets help from a backup electric heater, and depending on the model you can prioritise heating or hot water.
Systems on the market
These are some systems from brands we work with. The data comes from the manufacturers and configurations may vary by model.
Daikin X Series (new in 2026)
Combines air-to-air and air-to-water in a single outdoor unit: up to 4 indoor air units, underfloor heating or radiators, and a 180 or 230 litre tank. For homes up to 150 m². Awarded at EFINTEC 2026 and launching in phases across Europe from September 2026.
Mundoclima Multi ACS (H14 series)
2x1 setups with a 100 litre tank or 3x1 with a 190 litre tank. Hot water by heat recovery, R32 refrigerant and Wi-Fi control.
Kosner Aquanova Multi
One outdoor unit with up to two or three Nova series indoor units (depending on the model) and a 100 or 190 litre glass-lined tank, with heat recovery.
Haier Multi 3S with 3S tank
100 or 200 litre tank with heat recovery. Compatible with wall splits, consoles, cassettes, floor-ceiling units and ducted units, controlled through the hOn app.
Other brands, such as Daitsu and Hyundai, also offer similar systems. During the visit we will recommend the system that suits you best, whatever the brand.
Who is it for?
- Flats and homes with several rooms that want cooling in summer and hot water without adding more equipment.
- Anyone who wants to replace an electric water heater and air-condition the home at the same time.
- Homes with little space on the façade or terrace, where only one outdoor unit fits.
- Second homes and coastal apartments, where air conditioning gets heavy use in summer.
Advantages and things to consider
Advantages
- A single outdoor unit for air conditioning and hot water.
- Hot water that makes use of the heat removed while cooling, according to manufacturers.
- One system to maintain, controlled from your phone.
- Fewer units outside than with separate air conditioning and heat pump systems.
Things to consider
- You need space for the hot water tank (100 to 230 litres, depending on the system).
- Depending on the model, using heating or air conditioning may be limited while the water is being heated. We go through it with you.
- It is a recent technology: range and availability differ from one manufacturer to another.
- In large homes or homes with underfloor heating, consider an air-to-water heat pump or a mixed system such as Daikin X Series.
How we do it
- Visit and studyWe look at the space, the rooms and how much hot water the household uses.
- We choose the systemNumber of indoor units, tank size and brand.
- We install everythingThe refrigeration side, the tank's water connection and the electrical work.
- CommissioningWe show you how to use it and take care of maintenance.
Torn between an electric water heater, a hot water heat pump and this system? Try the comparison tool on the water heaters page and we will pin it down during the visit.
Go to the water heater and heat pump comparison
Frequently asked questions
Can a multi-split replace my electric water heater?
In many cases, yes. The system's tank produces the hot water, with electric backup when needed. We assess it during the visit based on how much hot water you use.
How much hot water does it give?
It depends on the tank: current systems offer tanks of between 100 and 230 litres. Daikin states that its Multi+ system is designed for households of up to five people.
Does it heat the water in winter too?
Yes. The heat pump heats the tank and, when demand is high, the backup electric heater helps. In summer the heat removed while cooling is also put to use.
How many rooms can be air-conditioned?
Depending on the system, between 2 and 4 indoor units with a single outdoor unit, plus the hot water tank.
How much does it cost?
It depends on the system, the number of indoor units and the tank. We give you a fixed price after the visit, with no obligation.
Is it a new technology?
It is a recent trend: several brands introduced systems of this kind in 2026 and, at the EFINTEC fair in Barcelona, Daikin X Series won an award.
See also: Air conditioning · Water heaters and heat pumps · Maintenance and repair · Split or multi-split · Power calculator