How much does a good new heat pump cost? Looking for experiences!

2021-05-08 13:34:29

Right now, for example, an electric heater like the heat pump really annoys me. It's 21 degrees in the house and we're freezing. You don't have that with pellets or gas. You always get nice, quick warmth in the house.

Well, luckily we have a wood stove that I'm now heating up :)

I lived for a bit over 10 years in apartments with stoves. It was interesting as a child/teenager, and often nicely warm.

But what does gas/pellets do with underfloor heating that suddenly makes it less sluggish?

What I experience with my heat pump is very slow regulation. In very cold times, I help out with frequency blocking ranges, supply temperature boosts, or room control (also because of the seasonal performance factor) to raise the supply temperature faster. Then it can gladly go into relaxed regulation mode.

2021-05-20 11:38:23

We are currently renovating our single-family house, built in 1982, to KFW-55EE or 75EE (still to be decided) and are also considering which heating system to choose. Today we received an offer from the local heating installer for a ground source heat pump from Stiebel Eltron, just under 17 kW plus 4 drillings for a total of 62,000 EUR. About half of that cost is for the excavation company, the other half for the heating installer.

I don't have the comparative offers for the pellet system yet, but I think (or rather hope, and based on what I've read so far) that it will certainly be 20k EUR cheaper. Given the price difference, I think we'll go with the pellet system. We have about 240 m2 of living space (160 m2 of which is underfloor heating) and 130 m2 heated in the basement. Currently, we consume 35,000 kWh of heating oil per year and hope that after the renovation (new windows + doors, attic + blown-in insulation) we will get down to a heating demand of 20,000 kWh.

By the way, we have now decided on the pellet system (KWB Easyfire). The local heating installer has now quoted just under 50,000 for it. That includes a 6-ton earth tank in front of the house, an update to our underfloor heating with new valves and digital control in each room individually, a hydraulic balancing, and the retrofitting of a hot water circulation system in the house. Since we are implementing this as part of an individual renovation plan when replacing an oil heating system, we get 55% funding on it. That means in the end we will come to about 22,500 EUR. I think that's fair for the upgrade! We are excited.

Best regards

2021-05-20 13:14:32

I lived for a little over 10 years in apartments with stoves. It was interesting as a child/teenager, and often nicely warm.

But what does gas/pellet do to a floor heating system that suddenly it’s no longer so sluggish?

What I experience with my heat pump is very slow regulation. In very cold times I help out with frequency blocking ranges, flow temperature boosts, or ZH (also because of the COP), to raise the flow temperature faster. Then it can gladly go into the relaxed control mode.

With pellet gas you can easily run a flow temperature of 35 instead of 30 with a heat pump. It also always runs, and the heat pump cycles controlled by return flow without storage. That makes the technology extremely sluggish. The heat pump principle goes against comfort. My electrician already told me back then to install sockets and electric heaters in the bathrooms, because every one of his customers with a heat pump eventually came to him with that request. We haven’t done that yet, but sometimes a mobile heater runs in the bathroom.

2021-05-20 13:29:41

The heat pump principle speaks against comfort.

What does the heat generator have to do with comfort in underfloor heating?

2021-05-20 15:13:53

With pellet gas, you can easily run a flow temperature of 35 instead of 30 heat pump. It also always runs, and the heat pump cycles controlled by the return flow without storage. That makes the technology extremely sluggish.

That is nonsense. With two or three clicks, your heat pump can also run at 35°. And the hotter the heat generator, the more frequently it has to cycle. So the heat pump definitely cycles the least.
And the inertia of the underfloor heating has nothing to do with that either.

If 21° is too cold for you, I recommend setting it to 22° or 23°. That should help. ;-)

2021-05-20 17:00:43

What does gas/pellet do with underfloor heating that suddenly makes it no longer so sluggish?

What I experience with my heat pump is very slow regulation. In very cold times, I help out with frequency blocking ranges, flow temperature boosts, or ZH (also because of the COP) to raise the flow temperature faster. Then it can gladly go into relaxed control mode.

That is probably more due to your hydraulics or settings, my underfloor heating with BWT does not need any interventions.

It keeps the temperature accurate to the degree in the house whether it is 3 degrees or -15 degrees.

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How much does a good new heat pump cost? Looking for experiences!

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