Water Heater Sizing Information
For existing home replacements:
Replacing an existing tank water heater? If your
current water heater has provided adequate hot water,
and no other plumbing changes and/or renovations
that would require additional hot water demand are in
process or planned, then:
• The GeoSpring™ Hybrid Water Heater can replace
an equivalent size or smaller standard electric water
heater.
• If switching from gas to electric, the GeoSpring™ Hybrid
tank type water heater.
For new construction installation:
Residential Water Heater Sizing Guide
Gallon Capacity Recommended
Family
Demand*
Size
or GeoSpring ™
High
100 (378.5L)
5+
Avg or Low
High
3 to 4
Avg or Low
High
2 to 3
Avg or Low
High
40-50 (151.4-
1 to 2
Avg or Low
*Assumptions for Avg or Low Demand household:
- Use of standard or low flow shower heads (2.5 gpm/11.4
L per minute or less)
- No showers with multiple shower heads and/or body jets.
- Standard bathtub (no oversized/jetted tubs)
49-50300-2
Electric
Gas
75 (283.9L)
80 (302.8L)
50 (189.3L)
80 (302.8L)
50-75 (189.3-
283.9L)
50 (189.3L)
40 (151.4L)
50 (189.3L)
40-50 (151.4-
189.3L)
40 (151.4L)
40 (151.4L)
40-50 (151.4-
189.3L)
189.3L)
30 (113.6L)
Avg or Low
Water Heater Capacity and Increasing
Temperature Setpoint:
The water heater temperature setting strongly impacts
the amount of usable hot water available for showers
and baths.
of water heaters, including the GeoSpring™, is
performed according to Department of Energy (DOE)
• Safety regulations require a factory setting no greater than
125°F (52°C) for all new water heaters. Therefore, if your
old water heater was set to a hotter temperature than
your new water heater with a factory set setpoint of 120°F
(49°C), the new water heater may seem to provide lower
capacity than your old water heater. This can be corrected
by increasing the temperature setpoint.
• If more hot water capacity is desired, increasing the
temperature from 120°F to 135°F (49°C to 57°C) will
enable the same tank of hot water to last about 25%
or faucet.
• Increasing the water temperature setpoint may improve
the cleaning performance of dishwashers and washing
machines.
• The user can adjust the temperature setting to meet
their needs. Always read and understand the safety
instructions contained in the owner's manual before
adjusting the temperature setpoint.
Mixing Valves
•
commercially available. Contact a licensed plumber or the
local plumbing authority for further information.
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