ᐅ Electric Meter for Heat Pump in Combination with BAFA Subsidy and Photovoltaic System

Hello everyone,
I believe this topic has been discussed several times, but I couldn’t find a clear answer in the forum:

We are installing a heat pump funded by BAFA, which will also be powered by a photovoltaic system.
The heat pump will be supplied through the regular electricity tariff as well as the photovoltaic system.
The domestic hot water and heating water will be heated partly by the heat pump and partly by an electric immersion heater to use the photovoltaic electricity.

How many electricity meters do we need for the heat pump? Is a three-phase electricity meter sufficient (heat pump + immersion heater) to measure all power consumption?
Is an additional heat meter necessary?

Thanks and best regards,
Markus254

Flanged radiators? I might possibly understand that with gas. But it doesn’t make sense with a heat pump.
So please don’t have them installed.
Otherwise, please explain how this came about and what difference it is supposed to make.

Simply a bidirectional meter with both photovoltaic and heat pump behind it. That’s it.

RotorMotor schrieb:

Flange heater? I might possibly understand that for gas systems. It doesn’t make sense for heat pumps.
So please do not have it installed.
Otherwise, please explain how this came about and what difference it is supposed to make.

This referred to the heating element in the system, which is already integrated into the heat pump.

RotorMotor schrieb:


Simply a bidirectional meter with both photovoltaic and heat pump connected behind it. Done.

I don’t think that will be sufficient. The BAFA specifies the following:

“The amounts of electricity or gas consumed by a heat pump must be recorded separately. Peripheral consumers (electric heating element; source pump; control system) must also be taken into account. The heat quantities delivered by the heat pump must also be recorded separately. In addition to external electricity and heat meters, which do not necessarily have to be calibrated, energy balances integrated within the heat pump are also permitted.”

Why use the heating element when you have a heat pump? Completely pointless.

Have the electrician install a submeter ahead of the heat pump in the distribution panel. This has nothing to do with the official meters (or electricity tariffs).

guckuck2 schrieb:

Why use the immersion heater when you have a heat pump? That makes no sense at all.

I’m not entirely sure if the immersion heater would have helped in our current situation, but I’ve been thinking about it for days.
A few days ago, the gas heating system in our rental house broke down, so we’ve been without hot water for almost a week now. It’s tough when showering, but I’ve often thought that the immersion heater should still help in a case like this (heating system failure), at least to warm up the water, right? 🙂

netuser schrieb:

I’m not entirely sure if a heating element would have helped in our current situation, but I’ve been thinking about one for days.
A few days ago, the gas heating system in our rental house broke down, so we have had no hot water for almost a week now. It’s tough when showering, but I have often thought that a heating element should still be useful in such cases (heating system failure) to at least warm the water, right? 🙂

Exactly. The heating element is a backup solution for the heat pump. In the houses here in the neighborhood that use peak and off-peak electricity rates, the heating is switched off by the utility company during peak times. You could run the heating element now with the standard electricity tariff.