ᐅ Heat Pump Energy Consumption in 2019 on a Monthly Basis

Bookstar schrieb:

Currently, I’m again facing the issue— which I already had before my optimization— that there is very little flow everywhere. Upstairs, I can’t even get one liter even though all valves on the manifold are fully open. Downstairs, it’s 1.5 liters. Of course, the rooms upstairs are cooling down because of this; the bathroom is only 21.5°C (71°F).

I don’t know what could be causing this. As a non-expert, I would suspect the pump. Does anyone have any advice?

What kind of system do you actually have?

I also had to reduce the flow in the entire ground floor to ensure enough heat reaches the upper floor. This is normal. On the ground floor, I only fully opened two out of eight circuits, while the others are throttled from slightly to strongly. On the upper floor, most circuits are almost fully open.

As an example: our ground floor hallway is large, has an 80m (260 ft) circuit length, and is fully open because it needs to provide heat to adjacent rooms, the front door area, and the staircase. The upper floor hallway is small, also about 80m (260 ft) circuit length but with tight pipe spacing, no windows, and it adjoins warm rooms (bathroom, children's room, office). The upper floor hallway is significantly throttled. However, both hallways end up with similar return temperatures. This is why I recommend using an IR thermometer—you get a good sense of how much heat a circuit or room requires and can absorb. Room temperatures in the hallway are not important here; the goal is to avoid short circuits while still delivering ample heat through each circuit into the house.

We also often have relatively low flow rates; our heat pump regulates this dynamically (usually only 600 liters per hour (160 gallons per hour) for a total of 17 circuits). The temperatures still work out because the temperature difference increases slightly or the supply temperature is higher. Higher flow lowers the supply temperature, so if you can raise it a bit, try to do so.

boxandroof schrieb:

First year with an air-to-water heat pump in northern Germany.
1400 kWh of electricity
7100 kWh of heat (about 15-20% of that for domestic hot water for 2.5 people, rain shower)

A seasonal performance factor of over 5 for an air-to-water heat pump?
Are you sure?

But this is a funny discussion. So you’re supposed to heat your bathroom with a fan heater because otherwise it’s not efficient enough?
I have 16°C (61°F) in the bedroom and 23°C (73°F) in the bathroom.
Yes, oil heating, yes, an old building. Efficient? I don’t care.

apokolok schrieb:

Efficient? I don’t care.

A poor starting point if you want to join the discussion in this thread.

apokolok schrieb:

This discussion is quite funny. So the idea is to heat the bathroom with a fan heater because otherwise it’s not efficient enough?

Not really funny. If you have an oil heating system and an older building, you won’t contribute much here either.
A more fitting comparison for heat pumps and how people get it wrong is this: driving a car on the highway with the accelerator fully pressed while controlling your speed with the handbrake. It’s possible, but it makes little sense.

That’s correct. I mainly posted here because of the unrealistic annual performance factor mentioned by @boxandroof.

But it is a rather strange development that comfort is being lost due to new technology.
I mean, a fan heater in the bathroom—that’s really beyond acceptable.

I will also have to switch soon, but probably to gas...