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All in One Buffer Tank and Indirect Water Heater 400 L - Standard Diameter Lower & Upper Coil - (Φ16mm / Φ⅝") - Model No. CBIT400L2C16

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All in One Pressurised Buffer Tank and Indirect Water Heater - 400 L Capacity

Why Our Combined Buffer Tank and Indirect Water Heaters?

Our Combination of Buffer Tank and Indirect Water heater is a money saving investment for designers and installers looking to use various sources of energy. It's simply a Buffer Tank with two opposite Large Diameter (1 1/4") Inlet/outlets connections, Two Immersed Coils that can be combined in one (with the optional Coils Connection Piece). 

This gives our combined tank the flexibility to be used for various hydronic applications. They are a smart use when combing Air to Water Heat Pump, Thermal Solar Panels (such as Vacuum Tubes Solar Collectors) and conventional Make-up heat producing equipment (such as Boilers, Fire Places, etc...).  They save you the money for buying one individual Tank for each hydronic application.


Combi Buffer tank

Inner Tank Materials Food Grade SUS 304-2B 2mm thickness
Outer Tank Cover Material White Color Galvanized Steel 0.55mm thickness
Heat Preservation Layer 60mm of High Pressure Automatic Polyurethane Foaming Layer, Density of 36 Kg/m³ (2.24 Lb/ft³)
In Tank Heat Exchanger (Coil) Specifications TU1 Copper (Red Copper), Thickness: 1mm (0.04")
Immersed Coil Outer Diameter / Thickness 16mm (⅝") / 0.9 mm
Coil Inlet/Outlet Connection 20mm (¾") Male NPT
Bottom Coil (Option) 0.8m²
Upper Coil (Option) 0.5m²
Water Purification Magnesium Rod Installed
Backup Heat Standard 1" port for electric backup with mechanical thermostat (1.5 KW@ 120V electric resistance included)
Drain Port ¾" Female NPT (Bottom of Tank)
Safety T/P Port (Exhaust Port) ¾" Female NPT (for T/P Safety Valve)
Tank Inlet/Outlet Connections 32mm (1¼") Female NPT
Accessories Tank Feet, Screws, Safety T/P Valve
HSE Limited Warranty  5 Years against manufacturing defects
Water Tank Size

Φ700 (B) x1600 (H) mm - A=580mm

Tank Shipping Size 1700x780x780mm
Storage Volume 400 L


Friction Loss

Coils Friction Losses:

Lower Coil:

Flow (US GPM) Pressure Drop (KPA) Pressure Drop (PSI)
2 6.98 1.01
4 25.16 3.65
6 53.27 7.73
8 90.71 13.16
10 137.07 19.88


Upper Coil:

Flow (US GPM) Pressure Drop (KPA) Pressure Drop (PSI)
2 4.36 0.63
4 15.73 2.28
6 33.3 4.83
8 56.69 8.22
10 85.67 12.43


Technical Documents

 Tank Specifications

 Operation & Maintenance Manual