Reliant FVIR GAS WATER HEATER Informations techniques télécharger pdf (Page 34)

BULLETIN 35

NOT ENOUGH HOT WATER - GAS

CAUSES Complaints regarding an insufﬁ cient supply of hot water are typically the result of

a water heater that cannot meet the demands of the residence (both people and

appliances). The demand for sufﬁ cient hot water may also be exceeded if additional

people and/or appliances are added to the residence. Another factor that may reduce

the hot water output is mineral build-up. Reference Bulletin 13 to determine if mineral

build-up may be effecting your hot water output. The following test will help determine if

a water heater is supplying the intended amount of hot water.

TEST Please read all the steps of the test prior to beginning. NOTE: This test is based on

140° F storage temperature and these amounts are approximate.

STEP 1 Do not use any hot water for two hours to ensure the accuracy of this test. Turn on the

cold water at full ﬂ ow using a double handle faucet and time how long it takes to ﬁ ll a

one-gallon jug. Calculate the Gallons Per Minute (GPM) ﬂ ow rate as follows.

One-gallon Jug ﬁ lled in:

5 seconds = 12 gallons per minute

10 seconds = 6 gallons per minute

15 seconds = 4 gallons per minute

20 seconds = 3 gallons per minute

30 seconds = 2 gallons per minute

STEP 2 Using a thermometer, turn on the hot water and time how long it takes for the water

temperature to drop 30 degrees.

Gallons Per Minute (GPM) Flow Rate

1.5 2 2.5 3 3.5 4 5 6

30 Gallon Tank

14 min. 10 min. 8 min. 7 min. 6 min. 5 min. 4 min. 3 min.

40 Gallon Tank

18 min. 14 min. 11 min. 9 min. 8 min. 7 min. 5 min. 4 min.

50 Gallon Tank

23 min. 17 min. 14 min. 12 min. 10 min. 9 min. 8 min. 6 min.

65 Gallon Tank

30 min. 22 min. 18 min. 15 min. 13 min. 11 min. 9 min. 8 min.

75 Gallon Tank

35 min. 26 min. 21 min. 17 min. 15 min. 13 min. 10 min. 8 min.

100 Gallon Tank

47 min. 35 min. 28 min. 23 min. 20 min. 17 min. 14 min. 11 min.

119 Gallon Tank

56 min. 42 min. 33 min. 28 min. 24 min. 21 min. 17 min. 14 min.

Minutes to drop 30° F

Example: 10 seconds to ﬁ ll the one-gallon jug equals 6 gallons per minute ﬂ ow rate.

If the temperature drops 30 degrees in 6 minutes that equals 36 gallons of hot water.

This is normal for a 50 gallon water heater. The amount will be about 70% of the

capacity of the heater.

RESULTS If the test performed above results in a 70% (+ /- 10 %) capacity, then the heater is

performing per speciﬁ cations and a larger water heater should be considered in order

to meet the demand.

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Reliant FVIR GAS WATER HEATER Informations techniques Page 34

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