State Industries GS6, GSX, GPX manual GAS Water Heater Sizing Guide, Leakage Checkpoints

GAS WATER HEATER SIZING GUIDE

Use the following information as a guide to approximate the correct size water heater for the residence:

•30 gallon size (21 gallon draw) for one bath residence.

•40 gallon size (28 gallon draw) for two bath residence -or one bath with an automatic clothes washer.

•50 gallon size (35 gallon draw) for three bath residence - or two baths with an automatic clothes washer.

•When a whirlpool tub is part of the home equipment, it is suggested that the water heater storage tank capacity be selected based on the needs of the whirlpool tub. This method of tank sizing, will in most cases, cancel all statements above concerning tank sizing.

•High flow or multiple shower head installations must be sized for at least a 20 minute draw.

Table 2:

Tub Capacity to	80 gal.	90 gal.	100 gal.	110 gal.	120 gal.	130 gal.	140 gal.	150 gal.
Overflow Outlet at:
(120ºF Water) Min. Stored	80 gal.	90 gal.	100 gal.	110 gal.	120 gal.	130 gal.	140 gal.	150 gal.
Water Capacity**
(140ºF Water*) Min.	65 gal.	71 gal.	80 gal.	89 gal.	98 gal.	108 gal.	117 gal.	125 gal.
Stored Water Capacity**
(@ 160ºF Water*) Min.	54 gal.	59 gal.	66 gal.	74 gal.	82 gal.	90 gal.	97 gal.	104 gal.
Stored Water Capacity**

*A thermostatic mixing valve set for a maximum temperature of 120° F is recommended to be installed to prevent a scalding hazard.

**Based on tub water temperature of 105º

Note: Because the desired fill time is normally 10 minutes, recovery capacity is not used for this calculation. All water used is supplied by storage.

NOTE: The draw efficiency of a gas or electric water heater storage tank is considered to be 70%.

LEAKAGE CHECKPOINTS

A.	Water at the draft hood is water vapor which has	* To check where threaded portion enters tank,
	condensed out of the combustion products. This is	insert cotton swab between jacket opening and
	caused by a problem in the vent.	fitting. If cotton is wet, follow draining instructions
B.	*Condensation may be seen on pipes in humid	in the “Draining the Water Heater” section and then
	weather or pipe connections may be leaking.	remove fitting. Put pipe dope or Teflon® tape on the
C.	*The anode rod fitting may be leaking.	threads and replace. When you are finished, follow
D.	Small amounts of water from temperature-pressure	the steps in “Filling the Water Heater” section.
	relief valve may be due to thermal expansion or	A	C
	high water pressure in your area.
		B
E.	*The temperature-pressure relief valve may be
F.	leaking at the tank fitting.	E
	Water from a drain valve may be due to the valve
	being slightly opened.	D

G.*The drain valve may be leaking at the tank fitting.

H.Combustion products contain water vapor which can condense on the cooler surfaces of the tank. Droplets form and drip onto the burner or run on the floor. This is common at the time of start-up after installation and when incoming water is cold.

I.Water in the water heater bottom or on the floor

may be from condensation, loose connections, or
the relief valve. DO NOT replace the water heater		H
until a full inspection of all possible water sources	G
is made and necessary corrective steps taken.
Leakage from other appliances, water lines, or ground	F	I
seepage should also be checked.	6” (152.4 mm)
	MAXIMUM AIR GAP
	Figure 29

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