Armstrong International
IOM-706 V2.0
Flo-Direct Water Heater
Specifications — Heater
Page 4 of 45
Specifications
Heater
Materials of Construction
Component
Material
Canister
304 SS (10 ga.
≤
AFD-8000; 3/16 > AFD-8000)
Canister gasket
WARCO white (food grade buna rubber)
Flame tube
304 SS
Gas piping
Malleable iron with standard yellow finish
Water piping
Copper with brass or bronze fittings OR welded SS
Spray ring
304/316 SS
Pall ring
304 SS
Operational Specifications
Spec
English Units
SI Units
Gas supply pressure
2–6 psig (optimum 4–5.5 psig)
0.14–0.41 bar (optimum 0.28–0.38 bar)
Water supply pressure
30–100 psig with ± 5 psig variation
2.07–6.84 bar with ± 0.34 bar variation
Inlet water temperature
32 °F to 120 °F
0 °C to 49 °C
Outlet water temperature
185 °F
85 °C
Water temperature differential
10 °F to 140 °F
5.6 °C to 77.8 °C
NOx emission
30–50 ppm
Thermal efficiency
99.7%
Technical Specifications
• Flo-Direct water heaters are built to UL standard 795
• May be manufactured to comply with various other electrical or water quality standards
• Three-phase power is required; most available voltages may be accommodated
