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PFW cutaway view, insulation in silver

PFW

Multifunction Tank – Complete Solution Through Direct Mounting

  • buffer tank
  • 4 sizes · 2 Insulation
Volume
380–1,000
operating pressure
4.5 bar
test pressure
7.8 bar
Submit a request Data Sheet (PDF)

Sizes and Availability

4 sizes · 2 Insulation

As of Oct 28, 2026
  • Efficiency Class
  • Heat loss in W
  • Click a cell to open the item; use the arrow keys to move through the table.
4 of 8 combinations available for immediate delivery
Size Tank without insulation Ecoline Vlies silver Ecoline Vlies anthracite
380 380, Tanks without insulation: Diameter 650 mm Weight 78 kg Item No. 3713801 In stock 380, Ecoline Vlies silver: Efficiency Class C 88 W Item No. 37173801 Available immediately 380, Ecoline Vlies anthracite: Efficiency Class C 88 W Item No. 37173802 Available immediately
500 500, Tanks without insulation: Diameter 650 mm Weight 112 kg Item No. 3715001 In stock 500, Ecoline Vlies silver: Efficiency Class C 106 W Item No. 37175001 Available immediately 500, Ecoline Vlies anthracite: Efficiency Class C 106 W Item No. 37175003 Available immediately
800 800, Tanks without insulation: Diameter 790 mm Weight 116 kg Item No. 3718001 Delivery time: approx. 4–5 weeks 800, Ecoline Vlies silver: Efficiency Class C 127 W Item No. 37178001 Delivery time: approx. 4–5 weeks 800, Ecoline Vlies anthracite: Efficiency Class C 127 W Item No. 37178003 Delivery time: approx. 4–5 weeks
1000 1000, Tanks without insulation: Diameter 790 mm Weight 133 kg Item No. 37110001 Delivery time: approx. 4–5 weeks 1000, Ecoline Vlies silver: Efficiency Class C 141 W Item No. 371710001 Delivery time: approx. 4–5 weeks 1000, Ecoline Vlies anthracite: Efficiency Class C 141 W Item No. 371710002 Delivery time: approx. 4–5 weeks

Size 380

Size 500

Size 800

Size 1000

Description

The PFW multifunction tank is available in various sizes and is the ideal complete solution for heating, domestic hot water, and solar applications in single-family, two-family, or multi-family homes. Thanks to the internal piping and the flow-through principle, it enables a continuous supply of domestic hot water without temperature fluctuations. The fresh water station and the two heating circuit stations can be mounted directly on the storage tank. The internal piping ensures ideal stratification within the storage tank. Our PFW multifunction tank was developed in collaboration with Tuxhorn. You can find the corresponding components in Tuxhorn’s product portfolio.

The tank provides optimal conditions for quickly and efficiently connecting components directly to the tank, thanks to 1” male thread flat-seal connections.

Features

  • Insulation options (to be ordered separately): Ecoline fleece insulation (Made in Germany), color: silver (standard) available from stock; colors white and anthracite available upon request (2–3 business days)
  • Direct installation of the fresh water station is possible using flat-sealing sockets
  • Highest build quality
  • High-quality S235JR steel in accordance with EN 10025
  • Operating pressure: 3 bar
  • Test pressure: 4.5 bar
  • Maximum operating temperature: 95°C
  • Option to install a contact sensor
  • 5-year warranty

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