Offer Check Heating/Water Supply

Hello everyone!

We are (see other threads if interested) after a successful house purchase now in the process of completely tearing down the place (built in '64) and now want to slowly start with the rebuilding. We wanted to do quite a bit energetically anyway and will probably achieve Kfw70 now (thanks to insulation, thermal bridge calculation, and heating technology).

That’s all fine so far and shouldn’t actually be a big problem. We would like to mill an underfloor heating system into the screed across the entire area. According to the energy consultant, it should then be at least a gas condensing boiler with hot water via solar – and a central ventilation system. We went to the local providers with these specifications and asked for advice. The preferred provider advised us to go for a split heat pump to save acquisition costs and to be independent from gas.

Now the offer finally arrived and we were totally shocked. Here are the key points:

- Split heat pump with hot water storage and pressure equalization vessel (Buderus Logaplus package WPLS.2-3 11.2)
- Milling of a total of approx. 15 heating circuits in a total floor area of almost 120 sqm
- Piping of the heating
- Water supply, with the hot water running through a circulation line

Total gross cost: 27,500 €. Excuse me? Of that approx. 14,500 € for the heat pump, 8,000 € for milling, and the rest for a bathroom radiator and the water supply.

Alternatively, gas condensing boiler with solar (5 flat collectors) is supposed to cost even 17,000 €.

To my feeling, that is extremely expensive for the planned things. Could that be? Can someone give a qualified assessment? Or do we have to adjust our price expectations? The ventilation system is completely missing yet...

Thanks for feedback! :-)

I'll dig up your old thread. It looks like you created your target prices yourselves and did not consult a professional.

Hello

It looks like you created your desired prices yourselves and didn't consult an expert

Indeed, the ideas listed in the thread were a first rough concept. Since then, our financial plan has been reviewed, gradually refined, and now looks a bit different (more money...) by structural engineers, energy consultants, financial advisors, craftsmen, and the bank – even though in many points we are still moving along similar paths. After some work, for example, we are almost on budget for the windows, and completely on budget for the electrical work through manual labor. Regarding construction measures, we are still waiting for the final offers, but basically that looks good as well.

The 15k that we originally planned for the heating system is certainly not achievable with our current concept – especially since we have now also included the ventilation system.

Regardless of our budget, I believe the offer is completely overpriced. Or am I wrong?

Hello,

We went to the local providers with this information and got advice. The preferred provider recommended a split heat pump to save acquisition costs and to be independent of gas.

I don’t consider an air-to-water heat pump the best choice in a building from '64 ... my 2 cents.

Now the offer finally arrived and we were initially stunned. Here are the key points:

- Split heat pump with hot water storage tank and expansion vessel (Buderus Logaplus package WPLS.2-3 11.2)
- Milling of a total of approx. 15 heating circuits in just under 120 sqm of floor space
- Piping of the heating system
- Water supply, with hot water supposed to run via a circulation line

Total gross cost: €27,500. Excuse me? Of that, approx. €14,500 for the heat pump, €8,000 for milling and the rest for a bathroom radiator and the water supply.

That sounds about right. If the water draw-off points are one above the other, I would skip the circulation line.

Alternatively, gas condensing boiler with solar (5 flat collectors) would even cost €17,000.

A gas condensing boiler these days is about the same price/expensive as an air-to-water heat pump. Does your preferred provider who has flow temperature not have the right conditions?

Regardless of our budget, I think the offer is completely overpriced. Or am I wrong?

You are wrong. You should end up at about €40,000 total with a ventilation system.

Rhenish regards

To qualify an offer, you need at least two comparable offers. Otherwise, you never know if it is expensive or cheap. But no one can tell you that here. Especially with the few details provided.

By the way, we also installed underfloor heating during our renovation. As a heat generator, we chose the simplest option with an oil condensing boiler. (Gas does not exist here). Keep it Simple.

Thanks for the organized and informative answer! I hope that I can at least get a bit cheaper...

Yes, I also like to keep it simple. But to get the KfW subsidies, we do have to invest a bit. That's okay, that's what the money is for, but you still hope to save a euro or two...

We will definitely get the second (and possibly third) offer in the next few days.