Electric Pool and Spa Heaters

The Water Is Always Just Right . . .
with Little Giant® Electric Pool and Spa Heaters
for Motels, Hotels, Clubs, Homes, Public Pools

Any way you look at it, a swimming pool is an investment. Its value can be increased considerably by the use of a Little Giant® Electric Pool Heater, either during initial construction or any time during the life of the existing filtering system. You actually s-t-r-e-t-c-h out the season, start enjoying the water earlier and continue this wonderful outdoor recreation later in the year. Since there are few areas in the United States where the combination of make-up water, pool and air temperatures are not below comfortable levels most of the year, electric pool heating is practical just about anywhere.

Little Giant® Electric Pool Heaters will maintain desired comfort temperatures in any weather - or quickly return water temperature to a comfortable level after cool spells. This highly efficient electric heater can be mounted horizontally or vertically, in new or existing pools, and is delivered complete, ready to install in the filter-circulation system. From there on - it's a matter of setting the thermostat and enjoying the water whenever you like, for as long as you please!

• Inexpensive - Compare Our Prices
• Minimum Installation Cost
• Automatic Control
• No Special Plumbing
• Rust Resistant
• Installs Anywhere
• No Venting Needed
• Compact - Fits Any Pool
• No Flue - Gas, Condensation or Corrosion
• UL Recognized

This small heater is a complete hot water generator plant. It contains an electric heating element, thermostat, threaded fittings for inlet and outlet pipe, insulation and outer jacket.

The tubular heating element with integral thermostat is all copper construction. Built-in thermostat, temperature range 55° to 180°F, responds quickly and accurately to maintain predetermined temperature. The galvanized steel pipe body guarantees clean hot water for many years. Simplicity of construction allows for easy heating element replacement should this be required.

Easy to install - Just connect inlet and outlet pipes - connect to correct rated voltage - set thermostat - and turn on disconnect switch. (Be certain that heater chamber is filled with water and purged of air before energizing.)

*Note: Little Giant® Heaters can be connected to a three phase circuit. Consult your local electrician and codes.

Little Giant® Sizing For Swimming Pools

General Requirements

Most swimming pools are maintained at about 80°F. Keeping a swimming pool at 80°F, once it has been brought up to temperature, requires surprisingly little in the way of heating equipment. Convection heat loss from a heated outdoor pool takes place primarily from the surface of the water. Very little loss occurs through the sides and bottom of the pool, from radiation or conduction. Influencing the heat loss from the pool surface are:

1. Air Temperature
2. Wind velocity
3. Humidity
4. Surface area
5. Solar radiation
6. Rain
7. Difference in temperature between the water and air.

Since the pool may be shaded, and since skies may be overcast at times when heat is most needed, the warming effect of solar radiation (5) should be ignored. This means that the size of the heating equipment required to maintain the pool at a temperature of 80°F is determined by the local weather conditions (1, 2, 3 and 6 and 7 and the surface area of the pool).

Wind is a primary factor in the heat loss of a pool. The Little Giant sizing chart is based on a 10 M.P.H. wind and a 20 degree differential temperature between the water and the air. Using these standards, the thermal conductivity is 7 BTU/Hr. Sq. Ft./°F or 140 BTU/Hr. Sq. Ft. 20°F difference. A wind of 20 M.P.H. may double the heat loss. Thus swimming pools should be sheltered from the wind so as to prevent excessive heat loss and the requirement of a larger number of heaters.

It is recommended that four or more days be allowed to initially heat the pool in order to not oversize the heating equipment. Sometimes it may require a week or more depending on the heat loss conditions named above. However, once the pool is raised to 80 degrees much less heat input is required to maintain this temperature. Even a week initial heat-up time does not inconvenience a pool owner, since the heating can be commenced earlier in the swimming season, if necessary, and because of the advantage gained in the cost of the smaller sized heaters that can be used due to a slower initial heat-up period.

We recommend that both suction and discharge of the pool water, to and from the heaters, be located about 2 or 3 feet below the surface of the water. Consequently, water is only heated about 3 ¾ deep. Therefore much less heating time is required as compared to that necessary to heat the entire pool, which would be the case if the suction line is located in the very bottom of the pool. It is quite apparent there is no advantage in heating the pool below the 3¾ level. However if it is necessary to heat all the water, there will simply be a longer heat-time required: but the heat loss from the surface remains the same.

Sizing Your Swimming Pool Water

1. Simply figure the surface area of your pool in square feet.
2. Chart will select recommended number of 6 KW Little Giant® heaters which will heat the pool 3' deep with a 20 degree increase in temperature in 4 days. Then the heaters will automatically maintain the pool to the temperature as set on the heater's thermostats.

Surface Area sq ft	Capacity Gals to 3' Depth	BTU to Heat Capacity to 3' Depth in 96 Hrs 20°F rise	BTU Heat Loss During Heatup Time Based on an Average 100 BTU/Hr/10° Diff	Total BTU/Hr Required Based on 140 BTU/Hr 20°F	Approx. Operating Cost Based on BTU/Hr Heat Loss & 1¢/KW Rate	Number & KW Little Giant® Heaters** To Install	List Price
100	2,250	3,850	10,000	13,850 (4.05KW)	*4.0¢/Hr.	(6KW)	$290.00
200	4,500	7,600	20,000	27,600 (8.07KW)	8.0¢/Hr.	(11.5KW)	$450.00
400	9,000	15,400	40,000	55,400 (16.2KW)	16.2¢/Hr.	2-(11.5KW)	$770.00
600	13,500	23,100	60,000	83,100 (24.3KW)	24.3¢/Hr.	2-(11.5KW)	$770.00
800	18,000	30,800	80,000	110,800 (32.5KW)	32.5¢/Hr.	3-(11.5KW)	$1,155.00
1000	22,500	38,500	100,000	138,500 (40.5KW)	40.5¢/Hr.	4-(11.5KW)	$1,540.00
1500	33,700	57,600	150,000	207,000 (60.5KW)	60.5¢/Hr.	5-(11.5KW)	$1,925.00
2000	45,000	77,000	200,000	277,000 (81KW)	81.0¢/Hr.	7-(11.5KW)	$2,695.00

* Adjust Cost to Your Area Electrical Rate
** Connect in Series

Note: Use the correct number of heaters to obtain the desired number of kilowatts in order to heat your pool.

Installation - Air valves can be installed at both inlet and outlet of the heaters. If circulation is discontinued for any reason and water from the piping begins to run back into pool then both air valves open, breaking the siphon effect and preventing the water in the heaters from being drained out. This action protects the heating elements from burning out because when the water in each heater builds up to the temperature as set on each thermostat, the thermostat switch turns the power off. These valves eliminate the need for an expensive flow switch, although a flow switch can be used to turn the heater off when water flow is discontinuous.

Each heater contains a thermostat, rated to withstand the amperage (25.2) drawn by the 6KW heating element. Therefore an expensive contractor is not necessary; no matter how many heaters are connected together.

Each 6KW Little Giant® should be supplied power through #10 AWG or MCM wire or equivalent.

Installation should be made as close to the pool as possible.

After installation water should be circulated through the heaters until all air is eliminated from the circulating lines and heaters. Set each heater¹s thermostat to the required pool temperature, approximately 80 degrees. Power can then be turned on at the main switch to energize all heating elements. When water temperature warms to thermostat setting the last heater will turn off first, etc., and only the number of heaters necessary to recover the heat loss will remain on.

Note: Heaters must be grounded per NEC and/or local electrical codes.

OFF-PEAK POWER is a natural for swimming pool water heating. Losses are greatest during the night and night hours are off-peak hours but be sure that heat up time does not become excessive. Large on-peak demand-charges can be economically offset by larger kilowatt capacities operated only during off-peak hours. The utility company should be consulted in this connection.