Stiebel Eltron Vs "Conventional" Storage Tank Water Heaters

Stiebel Eltron Vs "Conventional" Storage Tank Water Heaters
This data is based on a family of four.

To see data based on a family of two, click here.

The following comparison is based on a family of 4.
Assuming 4 daily showers, 2 hand washing applications per person, 1 hand dishwashing based on filling the sink and 4 bathroom sink usages per day. Total of 93 gallons of hot water used per day.

	Stiebel Eltron	GE Electric (40 gal)			GE Electric (40 gal)	GE Natural Gas (40 gal)		GE Natural Gas (40 gal)
Model	Tempra 20	GE 40T6A	PE 40M9A	SE 40M12A	GG 40T6A	PG 40T9A	SG 40T12A
Energy Factor	0.98	0.88*	0.91*	0.93*	0.57*	0.56*	0.62*
Cost $/year	273	505**	489**	478**	395**	402**	363**
Savings $/Year		232	216	205	122	129	110
% Savings		46	44	43	31	32	30

	Stiebel Eltron	GE Electric (40 gal)			GE Electric (40 gal)	GE Natural Gas (40 gal)		GE Natural Gas (40 gal)
Model	Tempra 20	GE 50T6A	PE 50M9A	SE 50M12A	GG 50T6A	PG 50T9A	SG 50T12A
Energy Factor	0.98	0.86*	0.91*	0.93*	0.56*	0.54*	0.62*
Cost $/year	273	517**	489**	478**	402**	417**	363**
Savings $/Year		244	216	205	129	144	110
% Savings		47	44	43	32	35	30

*These Energy Factors are present in new appliances, a conventional electric tank will perform at 80% efficiency after the first year and degrade slowly thereafter. The Stiebel Eltron Tankless Water Heater is rated an incredible 99%+ efficient for the lifetime of the heater!
**ADD $150-$200 /year if you rent your tank.

Assumptions:

$0.0719 per kWh for electricity is the SW Ontario average electricity supply rate.
$0.38/cubic metre for gas is the regulated Consumers Gas natural gas supply rate (Jan 2001), included is a $10.00 per month service charge.

Hot Water Usage Estimates:
Average shower (10 minutes) - 20 gallons
Average clothes washer (one load) -- 10 gallons
Average dish washer (one load) -- 6 gallons
Average faucet flow -- 2 gallons/minute
Total average daily usage is 64 gallons per day
Usage Assumption:
Tank Temperature setpoint of 135° F, inlet water temperature of 55° F and 365 day a year use.

These comparisons are based on the U.S. Department of Energy Hot Water Usage Guidelines as reported on the Energy Efficiency and Renewable Energy Clearing-House.

Energy Factor and Average Annual Operating Costs based on D.O.E. (Department of Energy) test procedures.