Latest / RENEWA Sanierungsnavigator / Wärmepumpe im Bestand: Die wichtigsten Fragen & Antworten
Transcript
- Oliver: The heat pump is in new construction the commonly used heating system. But with real estate properties there are a number of typical questions that the owners have. And actually it always out to one question. Can I a heat pump in real estate or old construction? And today we get answers to these questions from my colleague Alexey. Alexey, I'll with the first big question, is always asked. It's the main question, as I mentioned earlier. Is a heat pump also in old buildings? Basically, yes. The question is less how old the building is. Is the building an old building? Is the a new building? The question is more the energy standard of the building. And you can say that almost every building is for a heat pump. The biggest lever is a clean planning. If you make can be that the heat pump still works, but very inefficiently. Okay, that means a renovation is probably not wrong from such house, but is such a renovation also before you a heat pump? Yes, should definitely pay to whether you have components that in the near future. would be useful, because if you the components on the latest level, they will energetically and you the heat pump on But basically, a heat pump can without complete repair. Individual adjustments are always useful, If the building was in 1930 and nothing has been repaired I would almost that there is no because hardly anyone has simply glassed windows at home. Then you do a basement, a roofing floor, a core insulation at These measures are sufficient to make the building for a heat pump. It's not necessary to a complete renovation of the building. And you have another advantage. The heat pump you buy for a renovated building is much cheaper. That's definitely nice. But actually a question that often comes up is about temperature lead. And the the lead is lower than in a gas station or in oil heater, which is the heater that in such an old building. Is the low lead temperature at all? Or do I have to something else? So of low lead temperature also that the heat transfer system is First all, the low pre-flow temperature at the heat pump is nice and good. Good for the heat pump, but if the result is that the heat bodies are at this pre-flow temperature, then it would actually mean that the building will simply not get warm. And accordingly, you should definitely about the heat transfer system. That could heat bodies, could be floor heating. Especially with heat bodies, is of course a topic. Floor heating is actually a no-brainer. It works. For heat bodies, 50-55 degrees should be maximum target. Lower temperatures are always better. In fact, topic of foot-bottom heating 10-15 years it was always so usus that you said, okay, I need a foot-bottom heating. Now you just you don't necessarily heat bodies What they to the requirements? Exactly, don't any floor heating at That's not necessarily necessary, it's for efficiency. But you don't to your heating body out and floor heating. The heating bodies have to big enough. That means they have to this pre-flow temperature of 55 degrees. We determine in the heating calculation. If they can only by 75°C, then it could mean that they are for 55°C. Because if you roughly calculate it's only half of the power that the heating body can And then many heating bodies too small. But that's also the If the building was in the 70s, then you have already repaired Or it's also useful to something on the cover and then it not necessary to heat bodies. This should be expected. Alternatively, can also try out. Basically, can use Heat bodies, floor heating, mixing systems, both ceiling heating, wall heating, whatever. The most are the heat bodies, because the temperatures are very different. With the whole surface heating, all this is very uncritical. One point I would again, there are also so-called heat pump heat bodies. These are heat bodies that have fans installed, which can at the same temperature. But honestly, a bit a niche solution, it's complicated to implement, because you need a power connection with the heat body. And then everything is bit elaborate and these things are also significantly more than normal heat bodies. It works with the normal Actually, I think I've even as a replacement solution for normal heating bodies. For people who want on heating costs. But maybe of heating costs in a moment. But it also always falls when it to heat pumps. Is the annual number of And I would exaggerate if I said I knew exactly what that is. So what is it? There are always these typical values that around. 3, 4, 5 and so on. Simply put, annual work number describes how much energy, over the year, is from 1 kWh of on average. So how much heat energy. If I a work number of 3, I produce 1 kWh of 3 kWh of So I 300 % efficiency. Simply put, physically wrong. The lower the forward temperature is, the better the work number In the case of left-firm pumps, not so high. So have to the forward temperature. Then the work number be higher. How much higher? It's always easy to There are many factors that Yes, is especially the influence factors for this are especially the insulation of the building, the heating system, so heat transfer system, lines and, but also very important, storage. And last but not the right setting. What I the year's working number, COP and year's working number are not the same. They describe something, they have a similar size order, but the year's work number describes energy amounts, that means how much energy, kilowatt hour, I to in to generate 1 kilowatt hour of heat, or just the other way around, if I 1 kilowatt hour of electricity, how much heat I out, but that is always seen over the whole year or generally over a period of With the COP, Coefficient of Performance, the number of points one point. That means, a COP alone doesn't you the evaluation of such an system at all. You always to know at what temperature, at what outside temperature, at the heat pumps, i.e. air heat pumps. Otherwise, can some numbers, because When it's warm outside, 20 degrees and you want to 25 degrees of water, then every heat pump is super super efficient. That doesn't you because you don't want to heat That definitely sounds plausible. If we now from the theoretical numbers, what do you for year numbers in storage construction for renovation projects? Yes, 2.6 or 2.5 to 5, 6. So the spread is huge. What's in between? We just talked about that little bit. Especially the type of heat pump. So is it an air-water heat pump? Is it a solar heat pump? Is it a water-water heat pump? Just generally, what source is this? And then course also planning. Did you plan or did you the existing building with the existing heating body and nothing else changed? Now we in average values. At the air-water heat pump it's 3.4. By the way, it was 3.1 So the 3.4 are from 2025, 3.1 2018. There is already slight increase that can be recorded and it is with these solar water heat pumps. There we are about always 1.0 above the current average of 4.3. 2018 it was 4.1. What is still very important is to say that is actually, could not determine that, no correlation between the We about the building and the efficiency of the heat pump. Which is a bit more to this argument. Planning is the most It's less about how old my building We'll into the show notes. So now we've the myth that you always need a floor heating. We said, or at least said, what conditions... how to it in storage and how it We the of and few other terms. Now, really to the topic, which is much interested, what does it at the end? So what kind of heat pump for in the end? In a single-family house, 20,000 40,000 euros in advance without further measures. That's course a very big spread. I was say, the tension is very low between 20 and 40. What exactly depends on how big the heat pump has dimensioned or how efficient the building is already damped? Or what can I on criteria? Yes, are definitely good points. One thing is to the other. When I've my building, I have lot less heat load and the heat pump smaller. When the heat pump gets smaller, it gets cheaper. This with the old heating systems, gas, oil and so on. The with heat pumps, but still... substantially, so that it from that perspective to a renovation of the building cave, because they are even cheaper than a larger heat pump. a inflow dam, that we definitely want cheaper. And for the difference between 20 and 40 thousand euros, I can a few windows. It depends on which ones, how big they are and so on. But load in the upper frame. You can also it dampened. And the other one, yes, a window cleaning also has a few other arguments. Now we have this spread, just we at 30,000 euros to the middle. That's still not little but in end I hope I a promotion A bit more. The first point that reduces the is the funding. 30-70 % is The building is also large. Most buildings are around 50-55%. And then there is the rest of There are also opportunities to this relatively cheaply. Even ⁓ specifically for WEGs, because ⁓ it is already very widely known what WEGs can or cannot afford. There are special credits for this, it a bit And then... you should only the investment costs after funding, but also the operating costs and, possibly, depending on the property, also the value increase of the property. In the could say that the projects don't fail on the money. But when to myths, there's always the topic, will my really warm Will such heat pump What can you say First of yes, if the layout is properly planned. If the heat pump too small, the building won't the worst case. It's essential to make a monthly bill and a proper planning. The problems always from wrong assumptions. It's about whether my house is getting warm, it's also about whether my heat pump consumes too electricity, or my heat pump breaks too Because the heat pump doesn't just a role... that the heat pump is large but additionally, also a point that it must not too big. It used to always the with the heating systems, gas, etc. If someone a calculation, then you just it % higher. No matter. And it didn't matter because the efficiency is totally independent of the power. How much performance, share of this gas tank now gives up or whether that 100 whether that 20 percent is no matter they can be tacked well that goes with heat pumps not quite so good and that's it's both about the minimum as well as maximum performance that can a heat pump in any case, I said good planning and then and thing runs well in winter. My colleague Mike has already something about He also to heat pumps in winter. I'll in the show notes. But what is a topic when we talk it is the subject of volume. So many really little bit prelude and say, oh god, now I'll you there, neighbor will me from now on because they may too loud. Maybe that was also a topic, but how is it today? How is it modern radio? So basically that was definitely an issue and it is bit today too. That is part of this right planning. Not all heat pumps have in the last five years that are still on the market, but there are significantly older ones and you can to say all devices that are older than so 4-5 years from the development are usually much louder. Why is that? They little smaller, so less heat exchangers outside and that's you have more air and then it's louder. What can you do Yes, basically two things, three things, two and a You take another device, is, larger heat pumps, larger external devices. a location is in the building that is not that far from the heating room but at the same time is not positioned so that it the residents or the neighbors. And then you can, but it mostly not necessary, make further sound protection measures. So there are soundproof hoods, soundproof walls and so on, but in most cases it not necessary. Then it's always about climate neutrality. What we always in the comments is, yes, nice and good, but the heat pump also with electricity. So how climate neutral can it run? Yes, so climate neutral as our electricity mix is, of that that depends on electricity mix always a bit away from but the renewable energies increase from share in our electricity mix in Europe, but already strong, especially in Germany and Maybe back to the number people The correlations are how much renewable energy we use. Because renewable energy, the main part of renewable energy, is on the spot. By the heat we get from the environment And not by the electricity. The majority is by the 1-2-3-3 distribution. That 2-3 of the heat comes from the environment. You can, from, it's also from Fraunhofer ISE, so to speak, to 68 percent less CO2 emissions than a gas tank emits a heat pump. This definitely strengthens the argument that it not so climate friendly. And we have it today with spreads, let's say 50 to 70 percent, let's assume. Then there is actually a of near future. I could with a combination of a photovoltaic system. The combination with a PV system is also If you a PV system together with a heat pump, you 25, 30, 40 % autonomy and up to 37 % your own consumption. build a battery storage then share will by 30-60 % of the building's and the own consumption will be 40-80%. So will increase very, very simply by using the battery storage system to the heat pump heat pump tips can to the heat pump. In itself, it every time that you photovoltaic battery storage and heat pump very smartly. But we still on the topic of climate damage, electricity. topic. How is that with cold products? So such a heat pump are cold products, are they still somehow climate-damaging? Nowadays, usual cold medicine is in the license sizes that in single and multi-family homes. Propane. And that is one of the natural cold medicines that additional funding or for which you get additional funding. And that is now even for license-sturting heat pumps in multi-family homes. The family houses is a good one, because often hear people say, okay, a family house, a heat pump, I've seen that it to work. In the family house area, it's not that much visible. But say, principle, a heat pump work for a family house? Yes, definitely. It works. The planning is definitely more complex. Especially the topic hot water preparation plays a big role. And the other topic that you to is who are the decision makers about the what are the budgets and so on. Especially with WG's it's relatively complex, but basically it's A good option are gas hybrid systems. There it's like this, then you have a water and heat pump and additionally a gas boiler that the top loads. It the advantage that you significantly less in such large buildings and In you this a bit in your planning for the next few years. Optimally, you when this gas tank be At latest, until 2045, should be out, because otherwise the gas very expensive. Then that good, Alex. Now tell me, what is your conclusion to the heat pump? Who is it for? Who should deal with What should you maybe pay So basically it's not a question of whether it works, but rather how it works. What do I to do to in my building? It always basically. And it doesn't matter when it was whether it's one-family house, whether it's multi-family house. It's much more about how to this system, what you have to pay And that's honestly... But if strong case a single case, then of course certain costs, the efficiency, the funding and so on, but you have in a single case what the meaningful path is. And I would say who such a single case, namely his single case, should simply ask. I also for in the show notes. Then you might also Alexey and can him That's it for today. Thank you for your time, Alexey and see soon. A few words from me My name is Michael Suhr. am the founder and manager of Reneva. We Reneva also know how complex energy repairs are today. Full of craft calendar, countless technical possibilities and a driving jungle that many owners rather brake than motivate. This is where we stand. We connect energy advice, qualified craft industries and digital processes to a clearly structured system. For your budget, we develop the best possible repairs for your real estate. We you highest possible funding and accompany you from the initial analysis to the implementation with only one permanent contact partner. If you want to know what your estate more then start the first step now. Visit us at renevadi.com and arrange an unconditional consultation.