Appendices

Reference Guide for Water Heating

 

 

 

 

 

 

ELECTRIC

 

 

 

 

GAS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Energy Costs:

 

 

Energy Costs:

 

 

 

 

 

 

 

 

 

 

 

KW x fuel costs = energy costs

Cubic feet x fuel costs = energy costs

 

 

 

 

 

 

 

 

 

 

 

 

 

100 x 0.05 = $5.00

 

 

100 x 0.75 = $7.50

 

 

 

 

 

 

 

 

 

 

 

To obtain gallons per hour

To obtain gallons per hour

 

 

 

(GPH) recovery

 

 

(GPH) recovery

 

 

 

 

 

 

 

 

 

 

WATTS

 

 

 

 

 

HOURLY INPUT (BTUs)

 

 

 

 

 

 

 

2.42 x (temp rise o F)

 

 

 

11.0 x (temp rise o F)

 

 

 

 

 

 

 

 

I have a 30-gallon electric

I have a 30-gallon gas heater,

 

 

 

heater, non-simultaneous

rated at 40,000 BTUs. What is the

 

 

 

operation, 4,500 watt elements.

recovery GPH if my cold water is

 

 

 

What is the recovery GPH if my

40o F and my thermostat is set to

 

 

 

cold water is 40o F and my

120o F?

 

 

 

 

 

 

thermostat is set to 120o F?

40,000

= 45 gallons per hour

 

 

4,500

 

 

 

 

 

 

 

 

 

 

 

= 23 gallons per hour

 

 

11.0 x 80

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.42 x 80

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Temperature Rise (o F)

Temperature Rise (o F)

 

 

 

 

 

 

WATTS

 

 

 

 

 

HOURLY INPUT (BTUs)

 

 

 

 

 

 

2.42 x GPH

 

 

 

 

 

11.0 x GPH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

I have a 30-gallon electric

I have a 30-gallon gas heater,

 

 

 

heater, non-simultaneous

rated at 40,000 BTUs. What is the

 

 

 

operation, 4,500 watt elements.

maximum temperature rise if the

 

 

 

What is the maximum

heater can recover 45 gallons per

 

 

 

temperature rise if the heater

hour?

 

 

 

 

 

 

can recover 23 gallons per hour?

40,000

= 80o temp

 

 

 

4,500

 

 

= 80o temp

 

 

11.0 x 45 rise

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.42 x 23 rise

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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GSW Signature Series Electric manual Electric GAS