Hello everyone,
We are currently trying to decide whether to choose a Weishaupt LS 8 air-to-water heat pump as a split unit or to go with a Kermi x-change dynamic ac 8 AW E monoblock instead.
The Kermi is said to be more efficient and can also use solar power "intelligently," but it comes with an extra cost of nearly 5,000. It’s clear that I won’t recover that 5,000 through more efficient operation alone, but maybe the maintenance costs are lower, the air-to-water heat pump is quieter, and so on.
Which option would you lean towards and why? What do you see as the pros and cons of these two units?
Thanks and best regards,
M. Gerd
We are currently trying to decide whether to choose a Weishaupt LS 8 air-to-water heat pump as a split unit or to go with a Kermi x-change dynamic ac 8 AW E monoblock instead.
The Kermi is said to be more efficient and can also use solar power "intelligently," but it comes with an extra cost of nearly 5,000. It’s clear that I won’t recover that 5,000 through more efficient operation alone, but maybe the maintenance costs are lower, the air-to-water heat pump is quieter, and so on.
Which option would you lean towards and why? What do you see as the pros and cons of these two units?
Thanks and best regards,
M. Gerd
G
Grantlhaua11 Nov 2019 12:37@M. Gerd
Are you installing a buffer tank? I actually only have one because of the photovoltaic system, as I use it to store excess energy. Storage systems are still too expensive, and a large buffer isn’t really cost-effective for heating operation.
It's about time. How large are your systems, @Lumpi_LE and @hampshire? I’m curious to see how much energy actually comes from the north side and how SolarEdge performs then.
Are you installing a buffer tank? I actually only have one because of the photovoltaic system, as I use it to store excess energy. Storage systems are still too expensive, and a large buffer isn’t really cost-effective for heating operation.
It's about time. How large are your systems, @Lumpi_LE and @hampshire? I’m curious to see how much energy actually comes from the north side and how SolarEdge performs then.
H
hampshire11 Nov 2019 14:299.99 kWp and currently a 9.6 kWh battery; the hot water storage tank still needs to be connected.
Whether a battery storage system is financially worthwhile depends mainly on assumptions regarding the number of charge cycles, expected service life, assumed price per kWh of capacity, estimated power loss over the years, and projected electricity prices in the calculations. These assumptions are often debated, which is why both viewpoints exist. Each is sometimes strongly advocated.
Whether a battery storage system is financially worthwhile depends mainly on assumptions regarding the number of charge cycles, expected service life, assumed price per kWh of capacity, estimated power loss over the years, and projected electricity prices in the calculations. These assumptions are often debated, which is why both viewpoints exist. Each is sometimes strongly advocated.
So currently, we have a 9.8 kWp system on a hipped roof with SolarEdge. Additionally, there is a battery storage system from Sonnen... yes, I know, criticize me as already mentioned, there are two camps on this, and given our usage and consumption, it should be worth it. Whether it actually will be, we’ll see.
For the heating system, I would like to go with Kermi and also directly choose the controlled mechanical ventilation system from Kermi. At the moment, a split system from Weishaupt and a Zehnder controlled mechanical ventilation system are planned. It’s not a bad alternative. They are good devices, so I find the additional cost of 5,000 (around $5,000) quite steep for something that is just a bit better. I doubt it’s 50% better, considering it is that much more expensive.
For the heating system, I would like to go with Kermi and also directly choose the controlled mechanical ventilation system from Kermi. At the moment, a split system from Weishaupt and a Zehnder controlled mechanical ventilation system are planned. It’s not a bad alternative. They are good devices, so I find the additional cost of 5,000 (around $5,000) quite steep for something that is just a bit better. I doubt it’s 50% better, considering it is that much more expensive.
G
Grantlhaua12 Nov 2019 06:35M. Gerd schrieb:
For heating, I would prefer to go with Kermi and also choose Kermi’s controlled ventilation system for living spaces. Currently, a split system from Weishaupt and a Zehnder controlled ventilation system are planned. That’s not a bad alternative. They are good devices as well, so I find the additional cost of 5,000 (approximate currency) quite steep given that it’s only somewhat better. I doubt it’s 50% better, which is how much more expensive it is.How much does the Zehnder system cost compared to Kermi?
Is it no longer possible to negotiate? Kermi is increasingly pushing into the heat pump market, so maybe something can still be arranged?
Where are you located?
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