R290 vs R32: Which Refrigerant Is Right for Your Heat Pump in 2026?
If you are researching heat pumps in 2026—whether for a new residential build, a low-carbon renovation, or a commercial project—the choice of refrigerant is one of the most critical decisions you will make. Among installers, specifiers, and homeowners across Europe, the debate centers on R290 (propane) vs R32 (difluoromethane).
With the latest European Union environmental regulations actively reshaping the HVAC market, the refrigerant inside your heating system is no longer just a technical detail. It directly impacts your system's seasonal efficiency (SCOP), heating capacity at low temperatures, installation requirements (monobloc vs split), eligibility for lucrative national subsidies, and long-term compliance under the escalating F-gas phase-down.
This comprehensive comparison breaks down the thermodynamics, safety profiles, regulatory status, and real-world financial incentives of both refrigerants to help you choose the future-proof solution for your property.
Why Refrigerant Choice Matters: The 2026 Regulatory Landscape
The HVAC industry is undergoing a rapid transition driven by environmental policy and consumer demand for high-efficiency heating. Three main drivers make refrigerant choice paramount today:
- The EU F-Gas Regulation (EU 2024/573): The strict phase-down of Hydrofluorocarbons (HFCs) is accelerating. By restricting production quotas, the EU aims to eliminate HFCs by 2050. Synthetic refrigerants like R32 are experiencing restricted availability, driving up service costs.
- PFAS Chemical Restrictions: Polyfluoroalkyl substances ("forever chemicals") are facing potential bans in Europe. R32 falls under the broader scope of chemical scrutiny, whereas R290 is a natural hydrocarbon and entirely PFAS-free.
- National Financial Incentives: European governments are actively penalizing synthetic refrigerants and rewarding the adoption of natural refrigerants with direct subsidy boosts.
R32: The Synthetic Standard
R32 (Difluoromethane, CH₂F₂) is an HFC refrigerant that replaced the older R410A as the baseline choice for split heat pumps.
- Environmental Profile: With a Global Warming Potential (GWP) of 675, it is a significant improvement over R410A (GWP of 2,088) but still remains a synthetic greenhouse gas subject to quota limits.
- Flammability & Safety: Classified as an A2L refrigerant (mildly flammable). It has a low burning velocity and requires high ignition energy.
- Application Scope: R32 systems perform exceptionally well in new-build properties with low-temperature emitters like underfloor heating.
R290 (Propane): The Natural Alternative
R290 (Propane, C₃H₈) is a natural hydrocarbon refrigerant. Long used in commercial refrigeration, it has quickly become the premium choice for residential hydronic heat pumps.
- Environmental Profile: R290 features a GWP of 3, making its direct environmental impact virtually zero. As a natural organic compound, it is exempt from the F-gas quota system and is completely PFAS-free.
- Thermodynamics & Temperature: R290 has excellent thermodynamic characteristics. It can easily achieve high flow temperatures (70°C to 75°C) without relying on inefficient electric backup heaters, making it the premier choice for high-temperature retrofits in older homes.
- Flammability & Safety: Classified as an A3 refrigerant (highly flammable). This requires rigorous factory sealing and outdoors-only placement, leading to the dominance of monobloc designs.
R290 vs R32: Key Differences at a Glance
| Technical Parameter | R32 (Synthetic HFC) | R290 (Natural Hydrocarbon) |
|---|---|---|
| Chemical Formula | CH₂F₂ | C₃H₈ |
| Global Warming Potential (GWP) | 675 | 3 |
| Safety Classification | A2L (Mildly Flammable) | A3 (Highly Flammable) |
| PFAS / Forever Chemicals | Yes (Contains fluorine atoms) | No (Pure hydrocarbon) |
| Maximum Flow Temperature | 55°C – 60°C | 70°C – 75°C |
| Ideal Application | New builds, low-temperature systems | High-temperature retrofits, renovations |
| EU F-Gas Quotas | Subject to strict phase-down cuts | Exempt (100% future-proof) |
| System Architecture | Primarily Split (some Monobloc) | Primarily Monobloc (outdoors) |
| Typical Seasonal COP (SCOP) | 4.0 – 4.7 | 4.3 – 5.2 |
| 2026 Subsidy Benefits | Standard rates | Premium rates (National bonuses) |
Comparative Analysis: Performance & Efficiency
1. Seasonal Efficiency (SCOP) & Operational Costs
R290 has superior thermodynamic properties compared to R32. Due to its lower density and higher latent heat of vaporization, an R290 compressor operates more efficiently across the entire temperature curve. R290 heat pumps typically achieve a seasonal coefficient of performance (SCOP) that is 5% to 10% higher than R32 systems under identical conditions, resulting in lower annual electricity bills.
2. Low-Temperature Heating Capacity
A major challenge for heat pumps is maintaining heating capacity when ambient outdoor temperatures plunge. R290 maintains its capacity better than R32 at low ambient conditions (e.g., -15°C). R290's physical properties allow it to operate at higher suction pressures, reducing compressor strain and keeping your home warm without auxiliary heating.
3. High-Temperature Retrofits
If you are replacing an oil or gas boiler in an older property with traditional steel radiators, you need high flow temperatures.
- R32 systems are physically constrained and struggle to output flow temperatures above 55°C–60°C efficiently.
- R290 systems easily generate flow temperatures up to 70°C–75°C. This allows you to retain your existing radiators, lowering the initial cost of retrofitting.
System Architecture: Monobloc vs. Split
The safety classification of the refrigerants dictates the physical design of the heat pump.
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- R32 Split Systems: Split systems separate the evaporator (outdoors) and condenser (indoors) via refrigerant lines. Because R32 is A2L (mildly flammable), the risk of indoor leaks is manageable under current codes, but requires F-gas certified installers to handle the refrigerant on-site.
- R290 Monobloc Systems: Because R290 is A3 (highly flammable), safety regulations restrict it from being piped directly inside the home. Therefore, manufacturers use a monobloc design where the entire refrigerant loop is hermetically sealed in the outdoor unit. Only water pipes enter the house. This eliminates any risk of indoor hydrocarbon leaks and simplifies installation for plumbers.
Financial Incentives: 2026 EU Subsidy Boosts
To accelerate the phase-out of high-GWP synthetic gases, several European countries offer direct financial bonuses for choosing natural refrigerants like R290:
🇩🇪 Germany (BAFA & KfW)
Under the German Federal Funding for Efficient Buildings (BEG), heat pumps using natural refrigerants (such as R290 Propane) qualify for an extra 5% subsidy bonus (Kältemittel-Bonus) on top of the base subsidy. This can raise total funding up to 35%–40% of the total installation cost, saving homeowners thousands of euros.
🇫🇷 France (MaPrimeRénov')
France's national subsidy scheme prioritizes high-temperature retrofits that replace fossil fuel boilers. Because R290 systems reach high flow temperatures without heating elements, they qualify for the maximum subsidy tiers. Additionally, environmental criteria increasingly favor low-GWP, PFAS-free natural systems over HFCs.
🇳🇱 Netherlands (ISDE)
The Dutch ISDE subsidy calculates payments based on the energy efficiency and refrigerant type of the heat pump. R290 systems receive premium ratings due to their higher seasonal efficiency (SCOP), netting homeowners a higher baseline cash-back incentive compared to standard R32 units.
🇮🇹 Italy (Ecobonus & Tax Credits)
Italy's tax deductions (65% Ecobonus) require strict compliance with minimum seasonal energy efficiency classes. Because R290 heat pumps achieve top-tier energy ratings (A+++ at both 35°C and 55°C flow temperatures), they guarantee eligibility for these extensive tax write-offs.
Which Refrigerant is Best for Your Project?
Choose R290 (Propane) if:
- You are retrofitting an older home: You need high flow temperatures (up to 75°C) to work with traditional radiators.
- You want maximum subsidies: You want to claim natural refrigerant bonuses like Germany's 5% BAFA boost.
- You want to future-proof your investment: You want to avoid future HFC taxes, F-gas quota supply shortages, and PFAS bans.
- You want the lowest carbon footprint: You want a GWP of 3 and zero forever-chemical emissions.
Choose R32 if:
- Upfront equipment budget is tight: R32 systems generally have a 10%–15% lower initial hardware cost.
- You are building a new home: Underfloor heating operates at low temperatures (35°C), where R32 is highly efficient.
- You have space constraints: You require a split system with minimal outdoor footprint.
Thermovo's Commitment to the Future
At Thermovo, we design heating solutions for the next generation. Our R290 Monobloc Series represents the pinnacle of modern green heating—combining quiet operation, high-temperature output, and natural refrigerant compliance. For projects where budget is the main constraint, our R32 Split Series offers high efficiency and reliable operation under the current transition period.
Frequently Asked Questions
Q: Is R290 safe for residential use?
Yes. Modern R290 heat pumps are hermetically sealed and installed outdoors (monobloc). Only water pipes enter your home, meaning there is zero risk of flammable gas entering the living space.
Q: Will R32 heat pumps be banned?
R32 is not banned yet, but the F-gas regulation quota cuts will make synthetic HFCs increasingly scarce and expensive to service in the 2030s.
Q: How much extra can I save with natural refrigerant subsidies?
In countries like Germany, choosing an R290 system unlocks a 5% bonus. On a €15,000 installation, this represents an extra €750 in direct government support.
Disclaimer: Heating requirements vary by building insulation and location. Always consult a qualified Thermovo partner or heating engineer for a personalized system design.
