Tml XPC01500F Kombinox combined heat storage tank lt. 1500 stainless steel AISI 316L without coil insulation flex

Combined Thermal Storage Tank Kombinox 1472 Litres – Heating Buffer + Internal DHW Tank 250 L – XPC01500F

The XPC01500F is a "tank in tank" combined thermal storage system with a capacity of 1472 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 250 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 – XPC01500F

• External buffer (heating storage):
• Material: Carbon steel S235Jr – bare inside – anti-rust coating outside
• Max pressure / Max temperature: 3 bar / 95°C
• Buffer capacity: 1472 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: 250 litres
• Cathodic protection: Replaceable magnesium anode
• DHW available at 45°C (buffer at 65°C mean, 20 L/min flow): 396 litres
• Insulation: flexible polyester + PVC 130 mm (B2 DIN 4102)
• ErP: Class C – Heat loss: 168.6 W
• Dimensions (insulated body): Ø 1000 mm × Height 2115 mm
• External diameter (insulation): Ø 1200/1260 mm
• Tilt diagonal R: 2210 mm
• Indicative weight (PCSS/XPCSS version): ~276 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 XPC01500F 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 1472-litre capacity provides adequate thermal storage for large residential buildings, villas, multi-apartment buildings and commercial premises.

Standards and Certifications

The XPC01500F complies with: PED Directive 2014/68/EU (Art. 4 Par. 3), Italian D.M. 6 April 2004 N.174, ErP Directive 2009/125/EC.