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ENGLISH
WWW.APTANKLESS.COM AQM TANKLESS ELECTRIC WATER HEATERS | 9
INSTALLATION
TECHNICAL DATA
11. Technical data
AQM
21 AQM 2.51 AQM
31 AQM
3.51 AQM 42 AQM 62
Item number 231045 232098 220816 232099 222039 220817
Phase 1 1 1 1 1 1
Voltage 110–120 V 110–120 V 110–120 V 110–120 V 220–240 V 208 V 220–240 V 208 V
Wattage 1.8 kW 2.4 kW 3.0 kW 3.5 kW 3.5 kW 2.6 kW 5.7 kW 4.3 kW
Max. amp, load 15 A 20 A 25 29 A 14.6 A 12.7 A 23.8 A 20.6 A
Min. recommended
circuit breaker size
1
15 A (SP) 20 A (SP) 25 A (SP) 30 A (SP) 15 A (DP) 25 A (DP)
Min. recommended
wire size
2
(copper) 14 AWG 12 AWG 10 AWG 10 AWG 14 AWG 10 AWG
Min. water flow to
activate unit
0.21 gpm
(0.8) l/min
0.40 gpm
(1.5) l/min
0.40 gpm
(1.5) l/min
0.40 gpm
(1.5) l/min
0.40 gpm
(1.5) l/min
0.77 gpm
(2.9) l/min
Recommended inlet
temperature range 41–77 °F (5–25 °C)
Nominal water volume 0.026 gal (0.1 l)
Max. working pressure 150 psi (10 bar)
Tested to pressure 300 psi (20 bar)
Weight 3.44 lb. (1.56 kg)
Height
Depth
Width
6 ½ in. (165 mm)
3 ¼ in. (82 mm)
7 ½ in. (190 mm)
Water connections
3
for
3
/
8
in. O.D. flex connector
Heating system Nichrome bare-wire
AQM 2-1 models are internally restricted to 0.32 GPM / 1.2 l/min.
AQM 2-1, 2.5-1, 3-1 ship with a 0.5 GPM pressure compensating ow-reducer/aerator that must be installed.
AQM 3.5-1, 4-2 ship with a 0.66 GPM pressure compensating ow-reducer/aerator that must be installed.
AQM 6-2 ships with a 1.0 GPM pressure compensating ow-reducer/aerator that must be installed.
1
This is our recommendation for overcurrent protection sized at 100% of load. Check local codes for compliance if necessary.
Tankless water heaters are considered a non-continuous load.
2
Copper must be used. Conductors should be sized to maintain a voltage drop of less than 3% under load.
3
Suitable for supply with cold water only.
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