Product guide
Zip AquaFlo II
®
Unvented water heater
Unvented stainless-steel cylinders
90 to 300 litre capacity 
Construction
• Direct, indirect and solar compatible 
unvented water heaters.
• Corrosion resistant Duplex Stainless Steel 
cylinder.
• High performance, low profile coil-in-coil 
heat exchanger.
• High performance CFC free injected 
polyurethane foam insulation.
• White plastic coated steel case resistant 
to scuffs and damage. 
•  External expansion for reliability and ease 
of maintenance.
• Cylinder pressure tested to 15 bar.
Installation  
For installation by a qualified installer in 
accordance with all national and local 
Building Regulations.
Intended for floor standing only – refer to 
Technical Data for weight when full.
Nominal Capacity 
Direct and Indirect units: 90, 120, 150, 
180, 210, 250 and 300 litres.
Solar Twin Coil and Solar Direct units: 150, 
180, 210, 250 and 300 litres.
Immersion Elements  
Incoloy construction 1¾” thread. Length 
14” Loading 3kW @ 240V.
Heat Exchanger  
22mm low profile, high efficiency stainless 
steel coil-in-coil.
Features and benefits 
Wide range of capacities from 90 litres up 
to 300 litres.
High grade Duplex Stainless Steel Unvented 
Cylinder for long life.
Incoloy immersion elements provide excellent 
corrosion resistance.
Titanium replacement elements available for 
high use applications.
Compact coil-in-coil heat exchangers provide 
fast heat up and recovery.
Multi-element options for faster heat up. 
High performance insulation ensures 
minimum heat loss.
External expansion for optimum reliability, 
more usable space and ease of 
maintenance.
No sacrificial anode. Avoids the need for 
regular inspection. 
22mm compression connections for ease of 
installation.
Cylinders tested to 15 bar.
25 year transferable cylinder warranty.
2 year warranty on all other components.
Fully approved to UK Water Regulations and 
Buildings Regulations Part G3 and Part L.
90 91
Controls  
Thermostat – adjustable up to 65°C.
Over temperature safety cut-out – 
Re-settable. Operates at 85°C.
Expansion relief valve – 6 bar. 
Temperature and pressure relief valve – 
90°C and 7 bar.
Tundish.
Two  way  valve  with  indirect  models.     
Pressure reducing valve – 3 bar. 
Expansion vessel – Pre-charged to 3 bar.
Plumbing  
For connection to 22mm mains potable 
water supply. 
Minimum water supply 1.5 bar, 20 l/min. 
Maximum water supply pressure 12 bar.
Electrical  
To be wired to a suitably rated double pole 
fused spur.
Installation must comply with current IEE 
regulations.
Approvals  
KIWA  approved  to  UK  Water Regulations. 
KIWA approved to UK Building Regulations 
Part G3 and Part L. 
Immersion element/thermostat BEAB 
approved and CE endorsed.
Warranty  
25 years on cylinder transferable 
(conditions apply).
2 years on all other components.
Hot water
Hot water










