AUTOMATIC HEATER AND 
THERMOSTAT COMBINATIONS 
A good heater and thermostat is a small expenditure that 
will more than pay for itself in the fish that didn’t die. 
Since most aquarium fatalities are caused by temperature 
fluctuations a heater is practically a must. Automatically 
controlled aquarium heaters are perhaps the greatest benefit 
ever devised for the Tropical Fish Aquarium. 
Because of their ease in handling, accuracy and control, we 
recommend the use of an automatic heater and thermostat 
combination in every aquarium. Single unit heating allows 
you to regulate the temperature in the individual aquarium 
without affecting other tanks. 
All automatic heaters listed on this page are guaranteed 
for one year by the manufacturer. 
WIL-NES #77 TWO-TUBE OUTSIDE ADJUSTMENT 
AUTOMATIC HEATER 
This two-tube unit combines smart 
good looks with heating effic- 
iency. Control knob, pilot light, 
hanger, tubes, are all built into 
attractive plastic housing which 
also holds TV and radio static 
eliminator. All parts replaceable. 
77 A— 8" Tube— 25 watt . $5.75 
77 B— 8" Tube— 50 watt... 5.75 
77-C— 8” Tube— 75 watt... 5.75 
77 D— 8” Tube—100 watt... 5.75 
77 E—10"” Tube— 75 watt... 6.00 
77 F—10" Tube—100 watt... 6.00 
77 G—12" Tube—100 watt... 6.50 
77 G—12" Tube—125 watt ... 6.50 
Single Pyrex tube holds sensitive ther- 
mostat, Everlast heating element, TV, 
radio static eliminator, and built in pilot 
light. Inside adjustment screw easily ac- 
cessible by removing rubber plug stop- 
per at top of tube. 
627 A— 8" Tube— 25 watt... $5.00 
627 B— 8" Tube— 40 watt 5.00 
627 C—10” Tube— 75 watt ee eee) 
627 D—10" Tube—100 watt..... 5.75 
627 E—12" Tube—125 watt......... 6.00 
627 F—12" Tube—150 watt....... 6.00 
WIL-NES #88 AUTOMATIC HEATER 
Undoubtedly the finest single tube 
combination heater and thermostat 
ever made. Molded plastic housing 
encases pilot light, outside adjust- 
ment control knob, and screw type 
clamp holder. Ultra-sensitive thermo- 
stat. All parts replaceable, “snap-on” 
parts available. 
88 A— 8” Tube— 25 watt $5.75 
88 B— 8” Tube— 50 watt... 5.75 
88 C— 8” Tube— 75 watt §.75 
88 D— 8” Tube—100 watt LAS 
88 E—10" Tube— 75 watt..... 6.00 
88 F—10" Tube—100 watt . 6.00 
88 G12" Tube—100 watt............. 6.50 
88 H—12” Tube—125 watt... 6.50 
88 1—15" Tube—150 watt............ 7.50 
te bf’ Wii-NEs 
AVTOMATIC HEATER 
WIL-NES #47 ECONOMY OUTSIDE ADJUSTMENT 
TWO-TUBE AUTOMATIC HEATER 
Here is a two-tube, outside adjust- 
ment heater and thermostat combi- 
nation, with built in pilot light, TV 
and radio static eliminator at a low- 
er price. Metal clamp holder. Built 
for long lasting service. 
47 A—8" Tube— 25 watt.......... $4.25 
47 B—8" Tube— 40 watt......... 4.25 
47 C—8" Tube— 75 watt......... 4.25 
47 D—8" Tube—100 watt............ 4.25 
625 GLO-LITE “PYREX” THERMOSTATIC HEATER 
Here is a good thermostatically con- 
trolled two-tube heater and thermo- 
stat combination at an exceptionally 
low price. Laboratory tested for ef- 
ficient, ecnomical operation. Sensi- 
tive thermostat, TV, radio static elim- 
inator in one tube, heater element 
in the other, held together by non- 
corrosive clamp hanger. 
625 A—7"' Tube— 25 watt............ $3.95 
625 B—7" Tube— 40 waitt......... 3.95 
625 C—8" Tube— 75 waitt........ . 4.25 
625 D—8” Tube—100 watt............ 4.75 
629 SUPREME THERMOSTATIC HEATER 
One of the oldest and most reliable 
single tube outside adjustment heater 
and thermostats available. Built in pilor 
light, radio and TV static eliminator, 
metal clamp holder, 
629 A— 8” Tube— 25 watt... 
629 B— 8" Tube— 40 waitt.. 
629 C— 8" Tube— 75 watt... 
629 D—10"” Tube— 75 watt. 
629 E—10" Tube—100 watt... 6.10 
629 F—12" Tube—100 watt............- 6.50 
629 G—12"” Tube—150 waitt.............. .. 6.50 
629 H—15" Tube—150 watt unc. 7.50 
629 I—15"" Tube—200 watt...... ary 7.95 
CORRECT SIZE IS IMPORTANT 
Heaters placed vertically in an aquarium should reach to 
within 1 to 2 inches from gravel at bottom of aquarium. 
For proper heat control we recommend the following length 
tubes and wattages for the aquariums as listed. 
2 to 3 gal. Chill Breaker—10-15 watt Heater with Thermostat. 
5 to 6 gal. 8’ Tube—25 watts. 8 gal. 8" Tube—40 waits. 
10-12 gal. 8” Tube—40 or 50 watts. 
15 gal. 8” or 10’ Tube—75 watts. 17 gal. 10’ Tube—75 
or 100 watts. 
20 gal. 10’ or 12” Tube—100 watts. 
23 to 26 gal. 12 Tube—125 waits. 
29-30 gal. 15’ Tube—150 watts. 
34-50 gal. 15'’ tube—150 or 200 watts—or 2 heaters, one 
in each end. 
A safe “rule of thumb” to follow when in doubt —tigure 
4 or 5 watts per gallon of water. 
The "ideal’’ temperature in most aquariums is considered 
to be 74-76 degrees F. When treating sick or diseased fish 
water temperature should be raised to 80-85 degrees F. 
IMPORTANT DON'TS 
Remember, a heater and thermostat is a precision instrument 
—and an electrical appliance. Treat it as such—use it, 
never abuse it, and it will provide years of trouble free 
service. We list below a few DON'TS to combat the most 
common causes of failure in heating equipment. 
DON‘T—Put heaters or thermostats in service without first 
carefully reading fully the manufacturers instructions which 
accompany all units. Keep these on file, refer to them oc- 
casionally to refresh your memory as to the operation of 
your heating unit. 
DON’T—Allow water to enter into tube containing heater 
or thermostat units. Always inspect glass tubes. carefully 
for signs of cracks, which will permit water to seep into 
tube. Never locate heater too close to filter or aerator, or 
underneath glass cover where drops of water can enter 
unit. Except submergible heaters—never fully submerge 
unit under water. 
EE es ee 
22 REPLACEMENT PARTS ARE AVAILABLE FOR ALL AUTOMATIC HEATER AND THERMOSTAT COMBINATIONS. 
