BELDT’'S AQUARIUM 
SAINT LOUIS, MO. 

GUARANTEED 
ELECTRIC AQUARIUM HEATERS 






Automatic Heater No. 7 
Solid Silver Contact Points 
with Condenser 
This heater is built into two 
8-inch glass tubes; 150 watts will 
heat aquarium; from 25 to 75 gal- 
lonss= Pricen.*..6- ee $5.00 

NO. 5 HEATER 
Aluminum Heater 
No. 5. These heaters come in 
single watts for following size 
aquariums. Don’t forget to state 
gallon capacity of your aquarium 
or wattage desired. We can supply 
them as follows: 
2 to 4 gal. tanks, 
4 to 5 gal. tanks, 
6 to 9 gal. tanks, 
Ito gal. tanks, 
to gal. tanks, 
to 35 gal. tanks, 
to 40 gal. tanks, 
Any of these priced 
10-watt. 
20-watt. 
30-watt. 
40-watt. 
60-watt. 
80-watt. 
100-watt. 
Ali of Our Automatic 
Heaters Are Fitted with 
Condensers to Prevent 
Radio Interference 



3 
eae | 
meee 
The “‘Watchman’”’ 
Automatic Glass Tube 
Heater No. 6 
Built-in Pyrex Tubes 
This automatic heater is de- 
signed for aquariums from 4 to 
20-gallon capacity. The thermo- 
stat is set to maintain a temper- 
ature of 76° F. However an ad- 
justment is possible by turning 
the small set screw on the back 
plate. <A fraction turn to the 
right increases the temperature. 
Price™.ea clin. 2e- eee eee $4.50 

ARE BELDT’S HEATERS 
SATISFACTORY? 
Wenatchee, Wash. 
You probably think it odd that I 
should send all the way to your aqua- 
rium but I find that your service is much 
more rapid than many of the coast cities. 
Jim ELMORE. 
Detroit, Mich. 
The things we ordered arrived safely, 
and thank you for such prompt service. 
Mrs. JAMES HELKA., 
Dayton, Ohio. 
Since we have installed the heater pur- 
chased from you, the temperature has 
been kept very regular. 
SIEGFRIED R. WENG, 
Director, Dayton Art Institute. 
Terre Haute, Ind. 
The heaters which I received from you 
are very satisfactory. 
Mrs. R. F. KINGErRY. 
Black River Falls, Wis. 
The heater and thermostat you sent 
me a few weeks ago have proved most 
satisfactory. 
ERWIN PETERSON. 
The cheapest merchandise 
is never the best. 

GLASS TUBE HEATER 

SUCTION 
cup 
These heaters are now supplied 
with special] metal hanger instead 
of suction cup hanger. 
Glass Tube Heaters 
Built-in Pyrex Tubes 
These Glass Tube Heaters are 
supplied with waterproof tops, 
rubber suction hangers, and com- 
plete with plug and 6-foot exten- 
sion cords. 
6-Inch Heater 
6-inch heaters can be supplied 
in following wattages: 10-watt, 
20-watt, 30-watt. 
Price complete, each................ $1.50 
8-Inch Heater 
8-inch glass tube heaters can 
be supplied in 25-watt, 50-watt, 
75-watt, 100-watt. Complete as 
illustrated. 
Mach. 3s. ee ee een $2.00 

Stainless Steel Heater 
The heating element is sealed 
into one-half by eight-inch stain- 
less steel tube. The special stain- 
less steel tube, 20 inches long, 
protects the rubber cord and pre- 
vents water from entering the 
heater. The heating element 
housing is closed with stainless 
steel discs; all joints are soldered 
with stainless steel solder; 100% 
stainless steel 
stainless steel; 



Watchman Thermostats 
These thermostats only regu- 
late the temperature and can be 
used with any non thermostatic 
heater. 

NO. 1 THERMOSTAT 
These automatic heat regula- 
tors will maintain a range of 
proper temperatures for tropical 
aquariums and are set for about 
75° EF. All are fitted with pure 
silver contact points. All of 
these thermostats are fitted with 
hangers and water-proof exten- 
sion cords. 
No. 1 
500-watt capacity, complete 
with outside control knob, will 
not interfere with radios. Has 
three-way plug attachment so 
that three heaters may be hooked 
to this one regulator. Size of 
glass tube, 8x1 inches. Price $6.00 
No. 2 
400-watt capacity with inside 
regulator, also has three-way 
plug attachment so that three 
heaters may be used with this 
regulator. The glass tube has an 
overall length of 8 inches. 
Price teen. oe ee ee ee $4.75 
No. 3 
100-watt thermostat is de- 
signed for two heater units for 
aquariums up to 380-gallon ca- 
pacity; the heat regulator is on 
the inside; the glass tube is 6 
inches! lonew se rice. == $3.75 
A special condenser is built in 
these thermostats to prevent ra- 
dio interference. 
All thermostats 
plugs as illustrated. 
have 3-way 
The Magnus Pump 
Marvel Air Flow 
The Magnus Pump occupies a 
4-inch space. Shipping weight, 
3 lbs. Will deliver plenty of air 
for 1 to 5 tanks. It is sold with a 
6-month guarantee. Uses 60 cycle, 
110 to 120 volts A.C. current. This 
pump can be used with any filter 
listed im this catalog. 
Price 
