ᐅ New heat pump to replace oil heating with existing radiators

strzata schrieb:

You young people probably won’t understand this.

LOL – here, young people also wear T-shirts and shorts in winter because of the warm temperatures. You’re not alone in wanting more warmth.

I have clearly communicated several times that we want it to be warm (at least 23°C (73°F)), especially since my daughter runs a medical practice on the ground floor and definitely does not want patients lying on an examination couch to have to be cold ;-)

Of course, you can heat all rooms to 23°C (73°F). However, 15 kW might be insufficient for that. Did the DWH heating engineer base your temperature requirements on your wishes, or only on the standard room temperature of 20°C (68°F)?

He promised me 23°C (73°F) consistently, and he even wants to guarantee that in the contract. Otherwise, I could claim it as a defect. My son-in-law says, “Promises are easy to make”…

At least this explains the heating demand of 58,000 kWh.
However, I still consider an annual performance factor of 4.9 to be overly optimistic. Such values are achievable with ground-source heat pumps or in regions like the Rhineland or coastal areas, where it rarely gets truly cold. This is not the case in Thuringia.

strzata schrieb:

He promised me a constant 23 degrees Celsius (73°F), and he even wants to guarantee that in the contract. Otherwise, I could claim it as a defect.

A car dealer can also promise you that you can always drive 200 kilometers per hour (125 miles per hour) on the highway. If you then consume 20 liters (5 gallons) of premium fuel, that’s not their problem.

It’s good that your heat pump offer includes an electric auxiliary heater. That means the heating costs in winter will be three times higher than the initial estimate, but so what? He didn’t promise low costs. And if your heating bills then exceed those of oil, that’s not a defect either. It’s due to the way you want to use it.

Enough joking around. You should get a more reliable quote. One that will probably require a higher upfront investment but not increased operating costs as well. Or how does it help to swap expensive oil for expensive electricity, while also having to pay for the heat pump installation?
A better approach is a sensible plan with new radiators (as needed) and significantly lower annual heating costs without any loss of comfort—in the long term.

... and above all: Reliable equipment is subsidized at 55%. I don’t know if the domestic hot water (DHW) unit is included in the list of eligible systems. In that case, the DHW offer is only inexpensive because you don’t receive any subsidy, or rather the operator cannot claim it.