The conditions of tariff H for heat pumps are much more specific than you might first think. Most people start researching when they have already decided to heat with a heat pump and want to take advantage of the reduced electricity tariff. However, it often turns out that not all equipment, not all designs and not all electrical networks are automatically up to scratch.
In this article we summarise how heat pump types the H tariff, what a separate meter means in practice, whether a buffer tank or additional heating is needed, and what to look out for at the planning stage.
What exactly does tariff H mean for a heat pump?
The H tariff is a discounted, seasonal electricity tariff that can be applied specifically for renewable heating systems, typically heat pumps. The discount is usually available during the heating season, via a separate meter, and is calculated only on the consumption of the heating equipment.
It is important to know that tariff H does not automatically „go with” a heat pump. It is subject to technical and administrative conditions imposed by the electricity supplier, which must be met at the time of system selection.
Which types of heat pumps qualify for tariff H?
The key question is the device itself meets the efficiency and technical parameters required by the service provider.
Generally speaking, the following systems are usually compliant:
- air-to-water heat pumps
- ground source (geothermal) heat pumps
- water-water systems
The decisive factor is efficiency. The electricity supplier typically sets a minimum seasonal efficiency level (SCOP), below which the H tariff is not allowed.
What about the monobloc h tariff?
Many people search separately to see if they can claim a monoblock h tariff. The answer is yes, as long as the device meets the efficiency requirements and the documentation proves it. There is no difference in principle between a monobloc and a split system in terms of tariff H. The decisive factors are:
- the manufacturer's certificate
- the corresponding SCOP value
- correct connection and documented commissioning of the system
What does a separate meter mean in practice?
One of the basic conditions of tariff H is that the heat pump must be operated from a separate meter. This is not just an administrative issue, but a concrete electrical network conversion. In practice:
- the establishment of a separate measuring point
- separate detachable circuit
- the heat pump can only operate from this meter
This also means that no other consumer, such as a boiler, electric heating panel or other household appliance, can be connected to the H-tariff meter.
In many cases, the existing electricity network may also need to be upgraded. This is particularly common in older detached houses where the original network was not designed to cope with such a large load.
Do I need a buffer tank to apply for an H tariff?
The conditions of tariff H for heat pumps do not in themselves impose a mandatory buffer tank. However, it is strongly recommended for certain technical designs to ensure stable operation.
A buffer tank is typically needed when:
- the system has a small water area
- underfloor heating and radiator circuit works in mixed mode
- the heat pump is oversized
- stability of defrost cycles is important
The buffer tank may therefore be justified not because of the H tariff, but because of the long-term reliability of the system.
Do you need supplementary electric heating?
Many people are afraid that if they have an electric booster heater in their heat pump, they will not qualify for the H tariff. This is not entirely true. Most modern heat pumps include a built-in electric heater cartridge that kicks in during extreme cold or emergency operation. This in itself is not a disqualifying factor.
The important thing is that the primary heating method for the system is a heat pump and that the appliance meets the efficiency requirements - this is clearly stated in the documentation.
SMARTAIR professional comment - what to look out for when choosing?
In our experience, the biggest mistake is when a heat pump is selected solely on the basis of the H tariff, rather than the actual heat demand of the building.
The following aspects should be taken into account when planning:
- do not choose an appliance without an accurate heat demand calculation
- check the manufacturer's certificates and SCOP value
- calculate the possible extension of the electricity network
- explore the possibility of setting up a measurement site
- request a prior technical agreement with the service provider
The H-tariff can offer significant savings, but only if the system is technically and administratively sound. A poorly sized or poorly documented system can lead to a refusal by the operator, which can result in significant additional costs ex-post.
Summary
The conditions of the H tariff for heat pumps are not complicated, but they are precise. Eligibility is based on a properly efficient installation, a separate metering design, correct wiring and proper documentation.
Whether you're considering a monobloc or split system, the key is design. The H tariff is not an afterthought „bonus”, but the result of technical decisions that need to be made well at the outset.
If you are unsure about which system is eligible for the H tariff in your property, it is worth seeking expert advice before choosing a device. A well-designed heat pump system is not only advantageous for qualifying for the reduced tariff, but also because it is stable and economical in the long term.