Tml XPC00800F Combined storage tank Kombinox lt. 800 stainless steel AISI 316L without coil insulation flex

Combined Thermal Storage Tank Kombinox 749 Litres – Heating Buffer + Internal DHW Tank 170 L – XPC00800F

The XPC00800F is a "tank in tank" combined thermal storage system with a capacity of 749 litres (total puffer volume), designed by TML Industrie Loddo for multi-energy installations with integrated domestic hot water production. The external carbon steel buffer stores heat from continuous and intermittent sources (solar thermal, biomass boiler, backup boiler, heat pump, heat generator), while the internal DHW tank of 170 litres in AISI 316L stainless steel (1.4404) ensures safe, hygienic hot water production. The system is configured without puffer heat exchangers.

Full Technical Specifications – XPC00800F

• External buffer (heating storage):
• Material: Carbon steel S235Jr – bare inside – anti-rust coating outside
• Max pressure / Max temperature: 3 bar / 95°C
• Buffer capacity: 749 litres
• Internal DHW tank (tank in tank):
• Material: AISI 316L stainless steel (1.4404) – Pickling and passivation inside and out
• Max pressure / Max temperature: 10 bar / 95°C
• DHW capacity: 170 litres
• Cathodic protection: Replaceable magnesium anode
• DHW available at 45°C (buffer at 65°C mean, 20 L/min flow): 286 litres
• Insulation: flexible polyester + PVC 130 mm (B2 DIN 4102)
• ErP: Class C – Heat loss: 130.5 W
• Dimensions (insulated body): Ø 790 mm × Height 1750 mm
• External diameter (insulation): Ø 990/1050 mm
• Tilt diagonal R: 1830 mm
• Indicative weight (PCSS/XPCSS version): ~182 kg
• Electric heater connection: 1½" fitting (not included)
• Warranty: 5 years

Operating Principle – Tank in Tank Technology

The Kombinox system uses the "tank in tank" principle: the DHW tank is physically immersed inside the buffer, using the heating circuit water volume itself as the heat exchange medium for DHW production. This approach provides an extremely large heat exchange surface and rapid heating times, while maintaining complete separation between the heating circuit (closed loop, technical water) and the domestic water (open loop). The heat transfer fluid in the buffer and primary heat exchangers must operate in a closed loop to prevent corrosion.

Multi-Energy Compatibility and Applications

The XPC00800F is designed to simultaneously integrate multiple heat sources: solar thermal collectors (upper heat exchanger, where fitted), biomass boiler (dedicated flow/return connections), gas or oil backup boiler, heat generator at high temperature, and heating system at high and low temperature (underfloor, fan coils). The large 749-litre capacity provides adequate thermal storage for large residential buildings, villas, multi-apartment buildings and commercial premises.

Standards and Certifications

The XPC00800F complies with: PED Directive 2014/68/EU (Art. 4 Par. 3), Italian D.M. 6 April 2004 N.174, ErP Directive 2009/125/EC.