Hot water at an economy tariff

Heat pumps make use of natural heat from various sources such as the air, ground or groundwater, to generate heating energy for your home.

There are, however, heat pump systems which operate independently of central heating systems to provide domestic hot water. In this section you can discover how hot water heat pumps – frequently called DHW heat pumps – work and what benefits they offer.

  • For new build and modernisation projects
  • Ideal addition to existing boilers or solar thermal systems
  • Hot water to 65 °C in heat pump mode only
  • Low outlay
  • Lowest running costs
  • Fully wired with straightforward installation
  • Environmentally responsible DHW heating

GENERATE HOT WATER SEPERATELY,

TURN OFF YOUR HEATING SYSTEM IN SUMMER.

There are many situations in which it is a good idea to separate your central heating and DHW heating systems. One significant benefit is that the central heat generator can be switched off outside the heating season, so saving energy over the long term. The fact is that many heat generators are oversized when it comes to DHW heating outside the heating season. As an additional benefit, switching your heating system off during the summer months extends its service life.

WASTE HEAT FROM YOUR HOUSE OR GEOTHERMAL ENERGY

DHW heat pumps generally use warm indoor air, or geothermal energy in some cases, to generate domestic hot water.

Ambient air from the interior is transferred to a refrigerant inside the heat pump. This refrigerant is compressed by a compressor and then used for generating hot water via a heat exchanger. The higher the room temperature the more efficiently these heat pumps operate. This way, energy efficient use can be made of waste heat, particularly from secondary rooms or storage spaces such as a boiler room, larder or a store room.

PERFECTLY

suitable for retrofitting.

Due to their operating principle and their high efficiency, DHW heat pumps are suitable for new build as well as for retrofitting in detached and two-family houses. Separating the heating system from DHW heating as an energy saving measure can be achieved quickly and simply. DHW heat pumps are also a worthwhile investment which will pay off over the long term, if you are looking to replace your old electrically heated DHW cylinder.

INCLUDING PASTEURISATION

AND THE HIGHEST HYGIENE STANDARDS

As the sole generator of domestic hot water for your home, DHW heat pumps are compact with a heating output that usually ranges from 1.5 to 2.5 kW. When choosing an appliance, its DHW capacity is a crucial consideration. Capacities of 200 to 300 litres are conventional. Pasteurisation is an important issue in the heating of DHW, as it affects both hygiene and health. Efficient DHW heat pumps also score highly in this respect: they achieve DHW temperatures of 60 °C without a supplementary booster heater, even at very low room temperatures, thus providing reliable protection against legionella bacteria. There is also no need to worry about a shortage of hot water. If DHW consumption suddenly increases, or if air temperatures fall very low, many DHW heat pumps have an additional electric booster heater to guarantee the required DHW temperature range. The appliances in OCHSNER's Europa Mini EWP, Europa 250 DK(L) and Europa 323 DK range achieve 60 °C at all times without electric booster heater in heat pump mode alone – making them both cost effective and environmentally sound.

FINDING THE RIGHT INSTALLATION LOCATION

FOR A DHW HEAT PUMP

The installation location for a DHW heat pump must be selected carefully. It must be frost free – ideally with temperatures that never fall below 10 °C all year round. Boiler rooms and utility rooms, where waste heat from heating systems, tumble dryers, refrigerators or washing machines can be used efficiently, are ideal. Laundry drying rooms or cellars where foodstuffs or wine are to be stored can also be used effectively. Due to the fact that DHW heat pumps extract warmth and humidity, foodstuffs keep longer and laundry dries faster. For installation, all you need is a power supply and central hot and cold water pipes. A drain must also be provided for any condensate that may form.

CLEVER COMBINATION

WITH A PV SYSTEM TO SAVE EVEN MORE ENERGY

The efficiency of a DHW heat pump can be boosted even further by combining it with renewables such as a solar thermal or photovoltaic system (PV) on the roof. By linking the DHW heat pump with a PV system, the on-site consumption of the solar power generated can be increased significantly. OCHSNER DHW heat pumps are "Smart Grid ready", being equipped with the technology required, so that they can be easily linked with a PV system. If solar thermal energy is available, the solar collectors on the roof are the first to deliver heat to the DHW cylinder. The heat pump then covers any higher demand should the heat from the solar thermal system prove insufficient. Your OCHSNER system partner would be happy to explain the details as part of a personal consultation.

GEOTHERMAL COLLECTORS

FOR A HIGHLY ECONOMICAL DHW SUPPLY

Our experts can also inform you about innovative special types of DHW heat pump. You can also find models with geothermal collectors, using geothermal heat instead of air-borne heat, in the OCHSNER product portfolio. This solution is particularly attractive for new low energy and passive houses. DHW heat pumps with geothermal heat exchangers provide environmentally sound and highly economical DHW heating all year round, regardless of weather conditions. As the collectors are simply installed during construction in the ground around the foundations, they require no additional garden space.

ALL BENEFITS AT A GLANCE

Efficient and environmentally sound DHW heating, independent of your heating system:

DHW heat pumps make it possible. The perfect supplement to your boiler, they can be installed as an ideal alternative to solar thermal systems, or in combination with them. The Europa series of DHW heat pumps offers the following key benefits:

  • Highly efficient and durable
  • Environmentally sound DHW heating with air/extract air or geothermal energy as the heat source
  • EHPA Quality Label
  • Exceptionally quiet running
  • Quick positioning & installation – simply connect the appliance to the power supply as well as to the cold and hot water pipework.
  • Smart, simple-to-operate control technology with touchscreen
  • Up to 60 °C domestic hot water temperature
  • Additional functions such as cooling, drying and ventilating
  • Combination with solar thermal and/or PV possible
  • Suitable for modernisation projects, to complement existing oil, gas or biomass boilers