Low-flow Showerheads Compared to GFX

Table 1 --- Typical Savings for Low-Flow Showerheads
Annual Utility Savings ($) For 1, 2, 3 & 4 Showers/Day
Ordinary Showerhead	Low-Flow Showerhead	Gallons Saved per Person per Year	1	1	2	2	3	3	4	4
			Gas	Electric	Gas	Electric	Gas	Electric	Gas	Electric
3 gpm	2.0 gpm	3,290	16	38	32	76	48	114	64	152
4 gpm	2.0 gpm	6,580	32	76	64	152	96	228	128	304
5 gpm	2.0 gpm	9,870	48	114	96	228	144	342	192	456
Key: gas = gas-fired water heater; electric = electric water heating; gpm = gallons per minute; savings assume electricity priced at $0.08 kWh, gas priced at $0.60 per therm, and 50⁰F (28⁰C) rise in water temperature. [“Congressional Efforts to Rescind Low-Flow Toilets, Showerheads Are No Laughing Matter”, Energy Design Update, November 1999, Vol. 19, No. 11, pp.2-5]

Table 2 --- Typical Savings With GFX @ 50% Recycling Efficiency
Annual Utility Savings ($) For 1, 2, 3 & 4 Showers/Day (C: 1997)
Shower Flow Rate	Gallons of 105ºF Water per Person per Year	Shower Energy per Person per Year (kWh)	1	1	2	2	3	3	4	4
			Gas	Electric	Gas	Electric	Gas	Electric	Gas	Electric
2 gpm	6,580	804	16	38	32	76	48	114	64	152
2.5 gpm*	8,225	1,005	20	47.50	40	95	60	142.5	80	190
3 gpm	9870	1,206	24	57	48	114	72	171	96	228
4 gpm	13,160	1,608	32	76	64	152	96	228	128	304
5 gpm	16,450	2010	40	95	80	190	120	285	160	380
* Current Federal Standard; Water Heater Energy Factor: Gas: 52%, Electric: 85%

Table 3 --- GFX PERFORMANCE FOR LOW INCOME HOUSING Wrap/Keep Warm Program of Pennsylvania Utility PP&L, Inc.
Acc. #	Showers per day	Pre-GFX Water Heater Use kWh/Day	No. of Days Monitored w/ & w/o GFX	Post-GFX Water Heater Use kWh/Day	Annual Savings kWh/yr	Est. Annual Savings @ 8.5¢ per kWh	Est. Payback @ $500 Installed Cost	Est. Water Heating Savings
630-6331	5	18.56	71/166	15.15	1224	$104.04	4.8	18%
624-2437	5	17.76	92/176	11.60	1982	$168.50	2.65	34.7%
623-3615	2	8.6	64/221	6.45	774	$ 65.79	7.6	25%
624-4780	4.5	27.06	64/251	22.09	1788	$152.00	3.3	18.4%
631-0328	8	19.82	75/29	13.17	2347	$199.50	2.5	33.6%
Notes: 1. GFX Operating In Water Heater-Only Mode. (C: 1997) 2. Savings would be higher in Equal Flow Mode by a factor of 1.1 to 1.3 depending on hot water temperature. 3. PP&L's Winter Relief Assistance Program [WRAP] Manager is Linda Melenchek [610-774-3214]