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Explanations of common words and expressions.

Rock heat

Heat extracted from the bedrock. read more about rock heat

Rock heat pump

Pump used in rock heating systems. Pumps around liquid in the system and removes excess heat from the liquid that is pumped up from the bedrock. More information about ground source heat pumps.


Heat factor that tells how the relationship between supplied and withdrawn energy.


Cooling factor that tells the relationship between supplied and withdrawn energy.

Exhaust air

Air that is transported away.


Pipe / pipe that transports up energy.


Liquid used to cool air.


Removes moisture from the air.

Air heating

Heat extracted from the air. Read more about air heating.

Air heat pump

Extracts heat from the air and pumps around heat. More information about air source heat pumps.




A factor that shows how much of a home's heating needs a heat pump can cover.

Ceiling heating

Electric cassettes for ceiling mounting usually in villas. Large buildings can be heated with ceiling-mounted or suspended water-borne cassettes (strips). Occurs, for example, in sports halls workshops.

Hot water

The hot water consumed during washing, showering and the like. See also VVB.


Device that automatically controls the temperature of a device, a liquid such as hot water or in a room within specified limits.

Thermostat valve

Radiator thermostats control the heat dissipation from radiators. However, this regulation is based on running out "unnecessarily" hot water to the radiators. In VP operation, a room sensor is preferred that enables as low a flow temperature as possible.

Supplement / Supplementary heating

Supplements are the amount of energy that is calculated to come from sources other than the heat pump itself. The most common addition is an immersion heater mounted in or adjacent to the heat pump cabinet.


P = pressure. 10 mvp (meter water column) is 1 Bar and 100 KPa (KiloPascal).

Two-tube system

The most common pipe system for distributing heat to radiators and underfloor heating. The radiators are connected in parallel. In a two-pipe system, all radiators work with the same forward / return line temp, in a heat pump context this system is usually preferable as they are often of the so-called low-temp type.

Heated surface

Indicated in calculations for dimensioning of heat pumps. Several manufacturers use totally heated surface. Some differentiate between living space and other heated surfaces. Using living space straight off can be difficult, as not all surfaces are counted, for example surfaces under sloping roofs according to certain rules.

Outdoor sensor

Sensing the outdoor temperature, together with the selected heating curve, the VP control computer produces a setpoint. However, you should have a room sensor that compensates (fine-tunes) the room temperature in the event of wind, solar radiation, weather changes, etc. see also room sensors.


A measure of heat flow through, for example, windows, walls and ceilings. Low U-value means good insulation. U-value 1.0 means a heat flux of one watt per square meter of surface per degree that distinguishes temperature between outside and inside, W / m2 ° C.

Waterborne heat

Heated water that is pumped around in a pipe system with radiators (elements) to dissipate heat.

VB diff VP

For Nibe: temperature diff when forced control occurs. Same function (other name) as hysteresis on Thermia.


Ventilation is needed to supply fresh air and remove polluted air. This provides a good environment to stay in. Simple rules of thumb: The mirror in the bathroom should be fog-free in half an hour after a shower, otherwise the ventilation is insufficient. Condensation on the inside of the windows may indicate poor ventilation. Fan-controlled ventilation can be controlled by holding an A4 paper against the devices, an exhaust air device must be able to suck on an A4 paper.


Efficiency is an expression that shows how efficiently we use energy and how efficient an energy process is. The proportion of energy content of the fuel that benefits the house. The efficiency is usually stated in% for eg oil heating. Heat pumps are called COP.


(Tap) hot water, the hot water consumed during washing, showering and the like.


Water heater, it can be of different types and materials. Storage boiler with large hot water volume and an outer jacket with “radiator water. Camflange loop battery heater with small volume of hot water. It is heated in the loop in the boiler that contains "radiator water". It can also be electric as there are "wet" immersion heaters, shields are also used (externally) especially in aggressive water. The materials in the boiler are copper, stainless steel or enamel.


Hot water circulation. Circulation line for vv. Almost always in apartment buildings, in exceptional cases in villas (long plumb lines).


Heating, Ventilation and Sanitation.


Energy flowing from a warmer area to a cooler.

Heat carrier

A liquid, usually water, for transporting heat.

Heat factor

The heat factor (COP) is a value specified to indicate the efficiency of a heat pump. The heat factor is obtained by dividing the output power of the pump by the power it consumes.

Heat curve

A certain heating curve gives a flow temperature (setpoint) that should provide heat balance in the house. The need for flow temperature at a certain outdoor temperature (which the outdoor sensor senses) gives you the right heating curve.

Heat source

The equipment that emits heat to, for example, a radiator circuit. The heat source can be a boiler, heat pump or heat exchanger in a district heating system.

Heat pumps

There are many different types. mountains, surface soil, groundwater, sea heat, exhaust air, air-air, air-water

Heat exchanger

Device that transfers heat from one system to another without mixing the heat-carrying media.
The media are kept separate from each other by means of two channel systems.

Heat recovery from exhaust air

Reduces energy use - A heat exchanger can recover up to 90 percent of the heat in the consumed exhaust air, but in detached houses, however, often significantly lower efficiency. Normally returned as preheated supply air in ftx systems. Exhaust air heat pump is also a kind of heat recovery, it can also provide hot water.

Heat transfer

Heat can be transferred from one place with a high temperature to another with a lower temperature by conduction, convection or radiation.


Abbreviated W. Unit of effect. 1 W = 1 J / s.

Surface geothermal collector

A surface geothermal heat pump draws its energy from a buried hose. A surface geothermal hose is placed at different depths at different parts of the country. This solution is affordable, especially if you have a suitable plot and do some of your own work. Obligation to obtain a permit.

Annual heat factor

The heating factor varies during the year, and therefore one should start from the annual heat factor when calculating costs and energy needs. Annual heat factor is defined as the heat the heat pump or eg the oil boiler emits for a year divided by the energy it and other necessary components consume. The annual heat factor is usually between 2 and 4 on heat pumps. On oil boilers it is very difficult to measure (impossible) you have to assume a value. A standard 80% annual heat factor (annual average efficiency) is often used.

Excess air

Air that is led to the laundry room, toilet, bathroom via ventilated door frame or ventilated threshold. It can also be air that is carried from eg bedrooms to halls / rooms. To ensure good ventilation in wet rooms, it is better with an aerated threshold