Newly built single-family house, first occupancy in Impflingen

We bought the house

Even despite problems with the heat pump, I say: congratulations!

I am not familiar with the regulation of Bosch heat pumps, but a few things caught my eye at first glance that have nothing to do with your problem right now, but are not acceptable like this:

- Installation position of the domestic hot water circulation pump is wrong, it won’t last long like this
- Shut-off between drinking water safety valve and storage tank is not permitted (if it is closed and the heat pump heats the storage tank, it can burst)
- Installation position of the drinking water safety valve lying down is not allowed, the discharge pipe is also missing. If the expansion vessel (why anyone still installs such a germ incubator nowadays) is broken, the water will flood your technical room
- Thermal insulation is completely missing
- Whether the Cosmo standing tank is suitable for heat pumps at all due to the small heat exchanger surface should be clarified with a phone call to Bosch Service, I can’t imagine it
- If I see it correctly, the domestic hot water circulation line is connected with a T-piece at the hot water outlet. I lack the imagination of how the pump is supposed to draw the hot water from the storage tank.

If the rest of the system looks the same.

- Drain at backwash filter is missing
- Drain at system separator is missing

- Air pocket in the return line? from the storage charging line (where the expansion tank nailed to the ceiling is connected). The automatic air vent is positioned lower than the pipe

The longer you look at it, the worse it gets. I can also well imagine that the entire system is not properly vented. The heat pump then doesn’t remove the heat but continues to run due to the minimum run time and eventually shuts off with a relatively high flow temperature.

- Air pocket in the return line? From the storage charging line (where the expansion tank nailed to the ceiling is connected). The automatic air vent is positioned lower than the pipe.

The longer you look at it, the worse it gets. I can also easily imagine that the entire system is not properly vented. The heat pump then does not remove the heat, but continues to run due to the minimum running time and eventually shuts down with a relatively high flow temperature.

Thank you very much. We will bring in a master technician to assess the situation and, if necessary, take action against the client.

There is a new update. On Tuesday, the heating engineer is coming to take a look. What do you think about that?