Hot water boiler WTC-OB series

fuel oilcondensingcompact

Description
The Weishaupt oil condensing boilers convert fuel oil into efficient low-temperature heat in an economical and environmentally conscious way. Designed to modernize existing oil installations, they are available in power classes such as 20 kW and 25 kW, suitable for a variety of building types.

Energy savings
The WTC-OB consumes only 4 W in standby. It is equipped as standard with a low-energy consumption pump, significantly reducing electrical power draw compared with a conventional boiler.

Operation and fuels
Designed to operate with environmentally compatible fuels: domestic fuel oil F30 (PR NF XP M15-040) with a maximum viscosity of 6 mm²/s at 20°C. Incorporates a Weishaupt purflam® blue-flame, two-stage burner.

Compact unit
The WTC-OB combined with the WAS 155 storage unit forms a compact assembly, simplifying integration and installation.

Key benefits

• Multiple application areas thanks to a wide range of accessories and compatibility with existing hydraulic systems.
• Particularly quiet operation due to integrated sound traps on the flue and air intake.
• Long service life provided by an aluminium/silicon alloy heat exchanger, resistant to corrosion and offering excellent thermal conductivity.

High user comfort
Intuitive control: operation and configuration are managed via a remote control installed on the boiler or in the living area.

Model table (examples)
Model | Burner power min Qc | Burner power max Qc | Fuels | Efficiency 40/30 (LHV) | Efficiency 40/30 (HHV) | DHW volume (nominal) | Heating efficiency class | Heating label scale | DHW efficiency class | DHW label scale | Width | Depth | Height | Weight
WTC-OB 20-B W-KSK-WAB 155 | 15,2 kW | 20,7 kW | Standard heating oil EL, desulfurized EL, EL A Bio 10, paraffinic oil, without ash-forming additives | 105,0 % | 99,1 % | 148,0 l | A | A+++ - D | B | A+ - F | 680,0 mm | 1053,0 mm | 1 843,0 mm | 257,000 kg
WTC-OB 25-B W-KSK-WAS155 Bloc- | 15,2 kW | 25,2 kW | Standard heating oil EL, desulfurized EL, EL A Bio 10, paraffinic oil, without ash-forming additives | 105,0 % | 99,1 % | 148,0 l | A | A+++ - D | B | A+ - F | 680,0 mm | 1053,0 mm | 1 843,0 mm | 256,000 kg

Technical characteristics / specifications

• Series / model: WTC-OB
• Brand: Weishaupt
• Example power range: min 15,2 kW — max 20,7 kW (e.g. WTC-OB 20-B); max 25,2 kW (e.g. WTC-OB 25-B)
• Compatible fuels: Standard heating oil EL, desulfurized EL, EL A Bio 10, paraffinic oil (without ash-forming additives)
• Normalized efficiency at 40/30 (LHV): 105,0 %
• Normalized efficiency at 40/30 (HHV): 99,1 %
• Nominal DHW volume: 148,0 litres
• Heating energy efficiency class: A
• Heating label scale: A+++ - D
• DHW efficiency class: B
• DHW label scale: A+ - F
• Dimensions (examples): width 680,0 mm — depth 1053,0 mm — height 1 843,0 mm
• Weight (examples): 256,000 kg / 257,000 kg depending on version
• Standby electrical consumption: 4 W
• Burner: Weishaupt purflam® blue-flame, two-stage
• Heat exchanger: aluminium/silicon alloy, corrosion-resistant