GSW Signature Series Electric manual Electric GAS

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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