Installation Guide

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INSTALLATION
TEMPERATURE INCREASE ABOVE AMBIENT WATER TEMPERATURE
9.2 Data table
Model DHC 3-1 DHC 3-2 DHC 4-2 DHC 4-3 DHC 5-2 DHC 6-2 DHC 8-2 DHC 9-3 DHC 10-2
074050 074052 074053 074051 074054 074424 074055 232204 074056
Voltage V 120 208 240 208 240 277 208 240 208 240 208 240 277 208 240
Phase 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
Wattage kW 3.0 2.5 3.5 2.9 3.8 4.5 3.6 4.8 4.5 6.0 5.4 7.2 9.0 7.2 9.6
Ampere A 25 12 14 14 16 17 18 20 22 25 26 30 32.5 35 40
Min. required circuit breker size A 30 15 20 20 20 20 30 30 30 30 30 40 40 50 50
Recommended wire size AWG Copper 10 14 12 12 12 12 10 10 10 10 8 8 8 8 8
Min. water flow to activate unit GPM / l/min 0.32 / 1.2 0.32 / 1.2 0.42 / 1.6 0.42 / 1.6 0.42 / 1.6 0.48 / 1.8 0.69 / 2.6 0.79 / 3.0 0.79 / 3.0
Pressure loss in unit PSI / bar 2.88 / 0.23 2.88 / 0.23 2.88 / 0.23 2.88 / 0.23 2.88 / 0.23 2.88 / 0.23 3.13 / 0.25 3.75 / 0.30 3.75 / 0.30
Nominal water volume GAL / l 0.13 / 0.5 0.13 / 0.5 0.13 / 0.5 0.13 / 0.5 0.13 / 0.5 0.13 / 0.5 0.13 / 0.5 0.13 / 0.5 0.13 / 0.5
Working pressure max, PSI / bar 150 / 10 150 / 10 150 / 10 150 / 10 150 / 10 150 / 10 150 / 10 150 / 10 150 / 10
Tested to pressure PSI / bar 300 / 20 300 / 20 300 / 20 300 / 20 300 / 20 300 / 20 300 / 20 300 / 20 300 / 20
Weight lbs. / kg 4.6 / 2.1 4.6 / 2.1 4.6 / 2.1 4.6 / 2.1 4.6 / 2.1 5.3 / 2.4 5.3 / 2.4 5.3 / 2.4 5.3 / 2.4
Water connections " NPT 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2
- Suitable for supply with cold water
- Tankless water heaters are considered a non-continuous load
- Conductors should be sized to maintain a voltage drop of less
than 3 % under load
10. Temperature increase above
ambient water temperature
[ °F ]
Typ kW GPM (gallon per minute)
0.32 0.42 0.48 0.5 0.69 0.75 0.79 1.0 1.5 2.0
DHC 3-1 3.0 65 49 43 41 30 27 26 20 14 10
DHC 3-2
2.5 54 40 35 34 25 23 21 17 11 9
3.3 71 53 47 45 33 30 28 22 15 11
DHC 4-2
2.9 – 47 41 40 29 26 25 20 13 10
3.8 – 61 54 52 38 35 33 26 17 13
DHC 4-3 4.5 – 73 64 61 45 41 39 31 20 15
DHC 5-2
3.6 – 58 51 49 36 33 31 25 16 12
4.8 – 77 68 65 48 44 41 33 22 16
DHC 6-2
4.5 – – 64 61 45 41 39 31 20 15
6.0 – – 85 82 60 55 52 41 27 20
DHC 8-2
5.4 – – – – 54 49 46 37 25 18
7.2 – – – – 71 65 62 49 33 25
DHC 9-3 9.0 - - - - - - 77 58 41 31
DHC 10-2
7.2 – – - – – – 62 49 33 25
9.6 – – - – – – 82 65 44 33
Min. water flow to activate unit
[ °C ]
Typ / Type kW l/min
1.2 1.6 1.8 2.0 2.6 3.0 4.0 5.0 7.5
DHC 3-1 3.0 36 27 24 22 17 14 11 9 6
DHC 3-2 2.5 30 22 20 18 14 12 9 7 5
3.3 39 30 26 24 18 16 12 9 6
DHC 4-2 2.9 – 26 23 21 16 14 10 8 6
3.8 – 34 30 27 21 18 14 11 7
DHC 4-3 4.5 – 40 36 32 25 22 16 13 9
DHC 5-2 3.6 – 32 29 26 20 17 13 10 7
4.8 – 43 38 34 26 23 17 14 9
DHC 6-2 4.5 – – 36 32 25 22 16 13 9
6.0 – – 48 43 33 29 22 17 11
DHC 8-2 5.4 – – – – 30 26 19 15 10
7.2 – – – – 40 34 26 21 14
DHC 9-3 9.0 - - - - - 43 32 26 17
DHC 10-2 7.2 – – – – – 34 26 21 14
9.6 – – – – – 46 34 28 18
Min. water flow to activate unit