Hot water boiler WTC series

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Overview
The Weishaupt Thermo Condens® C condensing boiler is available in 15, 25 and 32 kW ratings. Designed for single-family homes and multi-family buildings, it delivers high thermal comfort and energy efficiency. Compatible with multiple gas types and convertible for operation on 100% hydrogen, it features an intuitive touch control and options for remote management.

Energy efficiency
The high-performance aluminum/silicon heat exchanger offers an absorption surface of 6600 cm² with thermal conductivity superior to stainless steel. A special coating (vitrification type) protects against corrosion and fouling. Indicated efficiencies vary by model (e.g. η30 up to 110.5% for some models).

Control and gas adaptation
Integrated CleanVario control automatically adapts the boiler to gas quality, gas/hydrogen blends and ambient conditions. The system is self-calibrating to ensure optimal efficiency and lasting performance.

Electrical consumption
Modern electronics and high-efficiency pumps, together with low water-side pressure drop across the exchanger, reduce electrical consumption, including standby power.

Gas types and hydrogen
The Thermo Condens® C is suitable for natural gas, biomethane, propane, biopropane, LNG and natural gas mixes containing up to 20% hydrogen by volume. It can be converted for 100% hydrogen operation (approvals and applicable standards referenced on the product page).

Product benefits

• Adaptive capacity: wide modulation range to consume only the required energy and extend burner life.
• Low noise: reduced operational noise through power modulation and intake sound insulation.
• Intuitive, connected control: integrated touch display, optional touch room thermostat, mobile app and WEM web portal for remote control and access.

Installation

• Hydrogen-ready: convertible for 100% hydrogen operation, compliant with relevant standards.
• Space-saving wall-mounted design; multiple flue gas exhaust solutions for varied installations (including lofts without traditional flue).
• Wide range of accessories available: DHW preparation, flue systems, hydraulic accessories, control components and solar sensors for DHW and heating support.

Model table and key characteristics
Model | Burner power min Qc | Burner power max Qc | Fuels | Efficiency Eta30 (PCS) | Efficiency Eta100 (PCS) | Heating efficiency class | Heating label scale | Width | Depth | Height | Weight
WTC-GW 15-C H | 2.0 kW | 14.0 kW | 20% hydrogen blend, Natural gas E/H, Natural gas LL, Liquefied gases B/P | 110.4 % | 98.2 % | A | A+++ - D | 520.0 mm | 335.0 mm | 792.0 mm | 43 kg
WTC-GW 25-C H | 3.0 kW | 24.0 kW | 20% hydrogen blend, Natural gas E/H, Natural gas LL, Liquefied gases B/P | 110.3 % | 99.5 % | A | A+++ - D | 520.0 mm | 335.0 mm | 792.0 mm | 49 kg
WTC-GW 32-C H | 3.0 kW | 30.5 kW | 20% hydrogen blend, Natural gas E/H, Natural gas LL, Liquefied gases B/P | 110.5 % | 99.5 % | A | A+++ - D | 520.0 mm | 335.0 mm | 792.0 mm | 49 kg

Control and connectivity
Control via integrated touch display; optional touch room thermostat. Configuration and control are also available via smartphone app and web portal (remote access, notifications, mode changes).

Technical features / specifications

• Brand: Weishaupt.
• Commercial name: Thermo Condens® C.
• Available outputs: 15 kW, 25 kW, 32 kW.
• Heat exchanger: aluminum/silicon, absorption surface 6600 cm², anti-corrosion/anti-fouling coating.
• Control: CleanVario (self-calibrating according to gas quality and ambient conditions).
• Compatible fuels: natural gas, biomethane, propane, biopropane, LNG; compatible with gases containing up to 20% vol. hydrogen; convertible to 100% hydrogen.
• Control interfaces: integrated touch display, optional room thermostat, mobile app, web portal for remote access/maintenance.
• Dimensions (W x D x H): 520 mm x 335 mm x 792 mm (for listed models).
• Weight: 43 kg (WTC-GW 15-C H), 49 kg (WTC-GW 25-C H and 32-C H).
• Efficiencies: e.g. η30 ≈ 110.3–110.5% depending on model; η100 ≈ 98.2–99.5% depending on model.
• Mounting: wall-mounted, multiple flue solutions for high installation flexibility.