The gas boiler market in 2024 is summarized by a single relevant technology: condensation. Classic and low-temperature models no longer meet current efficiency requirements, and financial aids for individual gas boilers have disappeared (MaPrimeRénov’ since 2023, CEE since January 2024, reduced VAT eliminated in 2025). The choice of a model depends on mechanical reliability, actual performance under usage conditions, and the ability to produce domestic hot water.
Before delving into the details of each device, it is important to remember that the RE2020 prohibits heating exclusively with gas in new single-family homes since January 2022. These boilers therefore concern renovations, a point that is rarely highlighted in a comparison of gas boilers on Expertise Maison or elsewhere.
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1. Frisquet Hydromotrix Condensation Visio: the reference for heating only
Frisquet manufactures all of its boilers in France, in Meaux. The Hydromotrix Condensation Visio is the flagship model of the brand for central heating installations without integrated hot water production. Its stainless steel heat exchanger provides superior durability compared to the market average.
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The claimed efficiency exceeds the standards for condensation thanks to an exchanger designed to maximize the recovery of latent heat from flue gases. The built-in regulation continuously adjusts the power, which reduces short cycles (repeated on-off operations) that prematurely wear out components.
The limitation of this model lies in its pricing position. Frisquet’s prices are significantly higher than the competition, and the network of authorized installers is less dense than that of Saunier Duval or ELM Leblanc. For a home already equipped with an independent water heater, it is still the most robust choice for heating only.
2. Saunier Duval ThemaPlus Condens: the best value for money in dual service
Saunier Duval dominates the French market for wall-mounted gas boilers. A subsidiary of the German group Vaillant since 2001, the brand benefits from one of the most extensive maintenance networks in the country. The ThemaPlus Condens provides both heating and instantaneous domestic hot water production.
Instantaneous production eliminates the need for a storage tank, simplifying installation in homes where space is limited. The hot water flow meets typical usage (one shower and one tap point simultaneously) but shows its limits in larger homes with multiple bathrooms.
Its purchase price, among the most accessible in the condensation segment, largely explains its popularity. Field feedback varies on the longevity of the exchanger beyond ten years, but the availability of spare parts partially compensates for this point.
3. Viessmann Vitodens 100-W: technology serving efficiency
Viessmann is a German manufacturer whose Vitodens range equips a significant portion of the European market. The 100-W model is positioned in the mid-range segment with a stainless steel Inox-Radial exchanger, a proprietary design that reduces fouling and improves thermal transfer.
The Inox-Radial cylindrical exchanger is the main technical argument of this model. Its geometry limits limescale deposits, maintaining efficiency over time, even in hard water areas. The power modulation goes low, allowing efficient operation even in mid-season.
The offered connectivity (ViCare app) allows remote control and consumption monitoring. However, maintenance costs through the Viessmann network may exceed those of competing French brands.
4. ELM Leblanc Megalis Condens: compact and suitable for small spaces
ELM Leblanc, a French brand acquired by the Bosch group, offers the Megalis Condens, a wall-mounted boiler designed for apartments and modest-sized houses. Its compact dimensions allow installation in a closet or technical niche.
- Dual service (heating and domestic hot water) in instantaneous mode, without a tank
- Simplified control interface, accessible without a mobile app
- Compatible with existing flue ducts (horizontal or vertical venting)
This model is not designed for large living spaces. Beyond a certain size of housing, the maximum power becomes insufficient to ensure uniform comfort. It is an ideal replacement boiler for a gas-heated apartment, not a choice for a large house.
5. De Dietrich Evodens AMC: the solution with integrated tank
De Dietrich, one of the oldest heating system manufacturers in Europe, offers the Evodens AMC, a condensing boiler coupled with an integrated hot water tank. This configuration meets a specific need: households with multiple simultaneous tap points or intensive hot water usage.
The integrated tank guarantees a constant hot water flow, even during simultaneous demands. This is the main advantage over instantaneous models like the ThemaPlus Condens or the Megalis Condens, which lose comfort as demand increases.
The trade-off lies in the footprint. The boiler-tank unit requires more generous floor or wall space. The installation is also more expensive, both for the equipment and for commissioning. For a home of four or more people with two bathrooms, this additional cost is justified on a daily basis.
Each of these five models meets a distinct use case: heating only, compact dual service, intensive hot water production. The performance criterion is not limited to the efficiency displayed on the technical sheet. Real performance depends on the match between the chosen model and the home, its size, insulation, hot water needs, and the quality of the local water.