Solar Thermal Information

52
Function
The solar water heater has either one or two internal coils and a
backup electric heating element in the single coil units. A heating
medium is passed through the solar panels and internal coil as long
as there is an adequate temperature difference between the heat-
ing medium and stored water in the tank. The internal coil is located
as close to the bottom to facilitate the transfer of heat even at lower
solar panel temperatures.
During periods of water flow through the water heater, hot water is
drawn from the top of the heater and cold water comes into the bot-
tom of the tank (by a dip tube or bottom inlet). On single coil tanks,
if the hot water demand should exceed the solar heat input or there
is an insufficient temperature difference between the heating medi-
um and stored water, the heating element thermostat will activate
the electrical heating element for backup heat. On double coil
tanks, the upper tank is connected to the boiler for backup heat.
Solar heat output from the internal coil will vary depending on out-
side conditions and the temperature of the stored water.
Technical specifications
Tank materials: porcelain coated steel
Tank insulation: 2" non-CFC foam
Tank external cover: powder-coated steel (20-24 ga.)
Insulation thermal conductivity: R16
Anode rods: 2 each magnesium
Internal heat exchanger coil (lower): 1-1/2" x 30' (50 gallon)
1-1/2" x 36' (80,119 gallon)
Internal heat exchanger coil (top): 1-1/2" x 24' (80,119 gallon)
Connections: 3/4" NPT (50 gal.), 1" NPT (80, 119 gal.)
Maximum working pressure: 150 psi
Testing pressure: 300 psi
Temperature and pressure relief valve: 210°F/150 psi max
Maximum tank temperature: 180°F
Recommended maximum delivery hot water temperature: 120°F
Power requirements (electric element): 240 VAC
Power consumption (electric element): 4.5 KW
Agency approval: UL listed
CALEFFI
Model
Actual Tank
Volume
(gal)
Coil Volume
Solar/Boiler
(gal)
Coil Surface Area
Solar/Boiler
(ft
2
)
Coil Friction Loss*
Solar/Boiler
(ft. of head)
Standby
Loss Rating
(°F/hr)
NAS20053 45 2.30/ - 11.78/ - 0.50/ - 51 1.1
NAS20083 75 2.76/ - 14.14/ - 0.60/ - 56 0.8
NAS20123 110 2.76/ - 14.14/ - 0.60/ - 56 1.2
NAS20082 73
2.76/1.84 14.14/9.42 0.60/0.40 158 0.8
NAS20122 108
2.76/1.84 14.14/9.42 0.60/0.40 158 1.2
First Hour Rating
(gal)
91
126
158
226
258
Recovery Rate
Solar & Backup
#
(gal/hr)
* Based on 5 GPM flow rate.
# Based on solar input of 140ºF @ 2 GPM. Depending on model, backup heat recovery is calculated with either
a 4500W heating element or a boiler with output of 180ºF at 14 GPM. Potable water temperature rise is 77ºF.
NOTES:
NAS20124 108 2.76/1.84 14.14/9.42 0.60/0.40 282 182 1.2
SolarCon solar water heater tank
series NAS200
Capacity and performance
Product range
NAS20053 Storage tank with lower coil and back up electric element 50 gallon
NAS20083 Storage tank with lower coil and back up electric element 80 gallon
NAS20123 Storage tank with lower coil and back up electric element 119 gallon
NAS20082 Storage tank with lower coil and top coil for boiler back up 80 gallon
NAS20122 Storage tank with lower coil and top coil for boiler back up 119 gallon
NAS20124 Storage tank with lower coil and top coil heat exchanger with back up electric element 119 gallon
Meets and exceeds CSA
C309 requirements