IREWA Scores:
Discover how Carbon underfloor heating outperforms heat pumps
Our consumption data reveals clear cost savings with IREWA heating – and it helps you save valuable time too.
Save €100,000 with IREWA Carbon underfloor heating – architect shows how
Location: Dußlingen, DE
House Size: 350 m²
Flooring: Parquet, tiles
Year of multi-family house construction: 2022
| FEATURES | IREWA | HEAT PUMP |
|---|---|---|
| Installation time | 5 days | 6 weeks |
| Investment costs | €45,500.00 | €85,000.00 |
| Consumption costs (20y) | €37,800.00 | €23,100.00 |
| Interest costs (20y) | €15,062.06 | €28,137.91 |
| Maintainance costs (20y) | €0 | €14,000.00 |
| Repair costs (20y) | €0 | €15,000.00 |
| Replacement costs after (15-20y) | €0 | €30,500.00 |
| Total cost | €98,362.06 | €195,737.91 |
| Total cost savings with IREWA compared to heat pump | €97,375.85 |
Energy demand according to energy certificate: 30 kWh/m²a.
Actual consumption values measured with IREWA: “Lower than the calculated values of the heat pump.” (Quote C. Bothner).
Christian Bothner from BW, Germany
Architect of a newly built multi-family house
"Efficient installation, impressive results.
The IREWA carbon underfloor heating system was installed in the new apartment building quickly and seamlessly. Residents are thrilled with the pleasant indoor climate and the high level of comfort. Thanks to smart metering, each tenant can view and control their own energy consumption — transparent, fair, and effortless. Even better: the actual energy costs came in lower than expected."
Price advantage: €67,177 with IREWA Carbon heating compared to heat pumps
Location: Altötting, DE
House Size: 173 m²
Flooring: Parquet, tiles
New construction in: 2022
| FEATURES | IREWA | HEAT PUMP |
|---|---|---|
| Installation time | 2 days | 5 weeks |
| Investment costs | €22,490.00 | €49,600.00 |
| Consumption costs (20y) | €21,798.00 | €16,400.40 |
| Interest costs (20y) | €7,444.96 | €16,419.30 |
| Maintainance costs (20y) | €0 | €6,920.00 |
| Repair costs (20y) | €0 | €9,690.00 |
| Replacement costs (15-20y) | €0 | €19,880.00 |
| Total cost | €51,732.96 | €118,909.70 |
| Total cost savings with IREWA compared to heat pump | €67,176.74 |
Energy demand according to energy certificate: 44 kWh/m²a
Actual consumption values measured with IREWA Carbon underfloor heating: 22 kWh/m²a.
Michi & Miri Starflinger from Bavaria, Germany
Newly built single-family home
"Switching to IREWA Carbon underfloor heating was one of our best decisions. Since upgrading to the IREWA carbon heating system, our home consumes just 20 kWh/m² per year — 50% less than the energy performance certificate for our KfW-55 efficiency house predicted. Compared to a heat pump, we’re saving €1,852 every year. The comfort is exceptional — the warmth feels natural and consistent, and everyone who visits notices the difference. We couldn’t be happier with IREWA!"
€58,538 savings with IREWA vs. heat pump – couple from Strem in Austria, chooses smart Carbon underfloor heating solution for new build
Location: Strem, Austria
House Size: 127,50 m²
Flooring: Parquet
Newly built in: 2022
| FEATURES | IREWA | HEAT PUMP |
|---|---|---|
| Installation time | 2 days | 5 weeks |
| Investment costs | €16,640.00 | €40,600.00 |
| Consumption costs (20y) | €16,128.00 | €12,134.40 |
| Interest costs (20y) | €5,508.40 | €13,440.00 |
| Maintainance costs (20y) | €0 | €5,120.00 |
| Repair costs (20y) | €0 | €8,340.00 |
| Replacement costs (15-20y) | €0 | €17,180.00 |
| Total cost | €38,276.40 | €96,814.40 |
| Total cost savings with IREWA compared to heat pump | €58,538.00 € |
Energy demand according to energy certificate: 42,20 kWh/m²a.
Actual consumption values measured with IREWA: 21,14 kWh/m²a.
Couple from Strem, Austria
New build single-family house
"Finally, a heater that warms up quickly and hardly consumes any energy – we are absolutely thrilled with IREWA!"
IREWA Carbon heating saves €53,975 in new builds: Satisfied customers in Burgenland, Austria, choose efficient heating over heat pump
Location: Litzelsdorf, Austria
House Size: 109,10 m²
Flooring: Parkett
IREWA installation in: 2021
| FEATURES | IREWA | HEAT PUMP |
|---|---|---|
| Installation time | 2 days | 5 weeks |
| Investment costs | €14,170.00 | €36,800.00 |
| Consumption costs (20y) | €17,004.00 | €12,687.60 |
| Interest costs (20y) | €4,690.80 | €12,182.00 |
| Maintainance costs (20y) | €0 | €4,360.00 |
| Repair costs (20y) | €0 | €7,770.00 |
| Replacement costs (15-20y) | €0 | €16,040.00 |
| Total cost | €35,864.80 € | €89,839.60 |
| Total cost savings with IREWA compared to heat pump | €53,974.80 |
Energy demand according to energy certificate: 51,08 kWh/m²a.
Actual consumption values measured with IREWA: 24,49 kWh/m²a.
Couple from Burgenland, Austria
New build single-family house
"Since we installed the IREWA carbon underfloor heating, we've truly experienced what real comfort warmth feels like. Additionally, the heating energy requirement according to the energy certificate has been halved with IREWA."
Renovated condo in Graz: Saved €47,160.96 with IREWA Carbon heating – Alexandra O. on pleasant indoor climate and premium heating flooring
Location: Graz, Austria
Condo Size: 78 m²
Flooring: Parquet
Year of renovation: 2024
| FEATURES | IREWA | HEAT PUMP |
|---|---|---|
| Installation time | 2 days | 5 weeks |
| Investment costs | €10,140.00 | €30,600.00 |
| Consumption costs (20y) | €14,040.00 | €9,828.00 |
| Interest costs (20y) | €3,356.69 | €10,129.65 |
| Maintainance costs (20y) | €0 | €3,120.00 |
| Repair costs (20y) | €0 | €6,840.00 |
| Replacement costs (15-20y) | €0 | €14,180.00 |
| Total cost | €27,536.69 | €74,697.65 |
| Total cost savings with IREWA compared to heat pump | €47,160,96 |
Energy demand according to energy certificate: 55 kWh/m²a.
Actual consumption values measured with IREWA : 31 kWh/m²a.
Alexandra O. from Graz, Austria
Renovation of condominium
"I’m absolutely happy with the underfloor heating in my renovated condominium. The indoor climate feels pleasantly harmonious, and the floor looks very high-quality. On top of that, I’ve saved both time and money with the IREWA carbon underfloor heating."
Forget the heat pump – too costly!
Real Estate Pro from Germany saves €44,115 with IREWA Carbon underfloor heating
Location: Heilbronn
Condo Size: 60 m²
Flooring: Vinyl
Year of renovation: 2024
Note: The consumption values are unknown because the renovated condominium was sold.
Frederic Schorndorfer from Heilbronn, DE
Renovated condominium
"The IREWA carbon underfloor heating system was installed in my newly purchased condominium in just one day. The savings in both cost and time made the resale of the apartment truly profitable."
6-year record low energy consumption in KfW-55 new build with IREWA Carbon heating
Location: Upper Bavaria
Heated living area: 214 m²
Flooring: Parquet, Tiles
Newly built in: 2018
Measured consumption from 25/10/2019 to 29/10/2025.
| 6-Year electricity consumption of IREWA underfloor heating including hot water | 26,503 kWh |
|---|---|
| Excluding hot water (600 kWh/year) | −3,600 kWh |
| Heating electricity consumption | 22,903 kWh |
| For 214 m² of heated living space: | 17.83 kWh/m²a |
| For 178 m² of continuously heated living space: | 21.44 kWh/m²a |
| Average annual consumption with IREWA Carbon heating: | 3,817 kWh/m²a |
Feedback of the residents
KfW-55 house
"Since installing the IREWA Carbon heating, we haven’t needed a single maintenance appointment or anything like that. Fantastic!"
New-build efficiency in an old building:
80% less energy use in two Frankfurt apartments with IREWA Carbon heating
Location: Frankfurt/Main, DE
Apartment size: each 95 m²
Flooring: Parquet
IREWA installed in: 2024
| Two people per apartment | Apartment 1 | Apartment 2 |
|---|---|---|
| Living space | 95 m² | 95 m² |
| Total electricity consumption | 6,501 kWh | 5,667 kWh |
| Minus household electricity | 2,800 kWh | 2,500 kWh |
| Minus hot water | 500 kWh | 500 kWh |
| Minus air conditioning | 500 kWh | 500 kWh |
| Electricity consumption IREWA | 2,701 kWh = €810 | 2,167 kWh = €650 |
| Electricity consumption IREWA per m² | 28.4 kWh/m²a | 22.8 kWh/m²a |
| Energy demand according to energy certificate | 144 kWh/m²a | 144 kWh/m²a |
| Total savings with IREWA compared to energy certificate | 115.60 kWh/m²a | 121.20 kWh/m²a |
Energy demand according to energy certificate: 144 kWh/m²a.
Actual consumption values measured with IREWA: 28,4 kWh/m²a and 22,8 kWh/m²a .
Feedback of the Residents
"The indoor climate with IREWA Carbon heating is excellent, and the costs are much lower than expected."
Save €12,000 with
IREWA Carbon underfloor heating – transform your cold sports basement into a cozy event room
Location: Ebersberg, DE
Basement Size: 55 m²
Flooring: Parquet
Irewa installed in: 2023
Total time savings with IREWA Carbon underfloor heating compared to a heat pump: 4.5 weeks
Horst Schmoll from Bavaria, DE
Renovation of big basement
"Our former sports cellar is now a cozy and frequently used game/event cellar. The entire room feels very comfortably warm thanks to the IREWA carbon heating, and the parquet floor looks great.
It’s like a brand-new room."
New Build Showdown: IREWA Carbon heating uses 10% less energy than heat pump in same local area
Energy-efficient house, built in 2018: IREWA Carbon heating under parquet and tiles
Location: Upper Bavaria
Heated area: 214 m²
Flooring: Parquet, Tiles
Newly built in: 2018
| Heating consumption: | 9,538 kWh |
|---|---|
| Heated living area: | 214 m² |
| Consumption per m²/year: | 44 kWh/m² |
KfW Efficiency House 55 – Electricity consumption:
All heating circuits are connected to a single meter, allowing for easy monitoring of total consumption.
Measurement period: late October 2020 to late June 2021.
Feedback of the residents
New single-family home
"Very easy to use. What I like most is the fast warm-up time of about an hour and the minimal space it takes up, as I don’t need a dedicated heating room. Absolutely recommendable."
Reference energy-efficient house, built in 2016 with timber frame & air-to-water heat pump
Location: Upper Bavaria
Heated area: 175 m²
Flooring: Parquet, Tiles
Newly built in: 2016
| Heating consumption: | 8,623 kWh |
|---|---|
| Heated living area: | 175 m² |
| Consumption per m²/year: | 49 kWh/m² |
KfW Efficiency House 39 – Electricity, same period:
Total: 12,473 kWh, excluding:
• Household electricity: 2,100 kWh (LED, A++)
• Hot water: 1,000 kWh
• Sauna: 750 kWh
Conclusion of the direct
new-build comparison
Even though the house has a more efficient design, the heat pump consumes about 10% more energy. This heating system also requires maintenance, which the IREWA Carbon underfloor heating doesn’t need at all.
Want to benefit from the affordable, efficient, and healthy IREWA carbon underfloor heating? Calculate your costs now!
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