Hello.
I am planning to install a Vaillant ground source heat pump VWF 88/4.
We are considering installing a second electricity meter to benefit from a cheaper tariff for the heat pump.
However, this meter would be off for up to 6 hours per day.
As far as I know, we do not have a buffer tank integrated.
Alternatively, we could use the regular electricity supply (one meter). Overall, this would cost about €250-300 per year more than with the heat pump tariff.
I am concerned that during the off periods, the electric heating element might turn on, and we could end up spending much more than the €250-300 savings.
How does the electric heating element usually work – does it only activate in emergencies, or does it always come on when hot water is drawn?
I would appreciate any answers or experiences.
I am planning to install a Vaillant ground source heat pump VWF 88/4.
We are considering installing a second electricity meter to benefit from a cheaper tariff for the heat pump.
However, this meter would be off for up to 6 hours per day.
As far as I know, we do not have a buffer tank integrated.
Alternatively, we could use the regular electricity supply (one meter). Overall, this would cost about €250-300 per year more than with the heat pump tariff.
I am concerned that during the off periods, the electric heating element might turn on, and we could end up spending much more than the €250-300 savings.
How does the electric heating element usually work – does it only activate in emergencies, or does it always come on when hot water is drawn?
I would appreciate any answers or experiences.
Michlhausbauaa schrieb:
Is the restriction period common?For heat pump tariffs, yes, but in our case it is limited to 4-5 pm and in the morning, I believe, 7:30-8:30 am.M
Michlhausbauaa19 Oct 2019 16:36tomtom79 schrieb:
Yes, there are special tariffs for heat pumps, but in our case, they only apply from 4 to 5 pm and in the morning, I think from 7:30 to 8:30 am.Do you need to understand the reasoning behind this?
Is the pump completely switched off during those times?
So far, we have had two meters, one of which was only for the heat pump with the heat electricity from enbw. Whether it was financially worthwhile? No idea, but as mentioned before, we had to pay two basic fees. Now, with the photovoltaic system and storage, it is never cost-effective, so it has been switched to a single meter.
M
Michlhausbauaa19 Oct 2019 16:41blackm88 schrieb:
We previously had two meters, one solely for the heat pump with the heat current from enbw. Did it pay off? No idea, but as mentioned, we ended up paying the base fee twice. Now, with photovoltaics and a battery storage system, it’s never cost-effective, so it has been switched to a single meter.Basically at regular household electricity rates?
Michlhausbauaa schrieb:
roughly at the cost of regular household electricity? Yes, let's see what the total consumption will be from January 1st for a year. We have an 8 kWp (kilowatt peak) system on the roof and a 10 kW storage battery. I'm curious to see how much will need to be purchased. On the other hand, there are the revenues from the PV electricity feed-in.
Michlhausbauaa schrieb:
Do you need to understand the reason behind it?
Is the pump completely switched off from power there? The purpose is to buffer peak loads. These peaks would overwhelm any power grid worldwide because at 7 a.m. everyone in the office is making coffee and every second person is turning on their PC.
However, as heat pump owners, we don’t really mind these blackout periods because hot water production should only take place around midday anyway when the outside temperature is highest.
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