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1. GENERAL 
 

1.1 Description of the heater 

Construction of the heater is in accordance with the European standard for water heaters 
or sanitary use. The heaters are suitable for use with a working pressure of up to 7 bar. 
The cylindrical tank is made from sheet steel. For protection against corrosion, the inside 
of the tank is glass-lined. The tank is also fitted with magnesium anodes for extra 
protection against corrosion. A thick, replaceable insulation jacket minimizes heat loss.  
 

1.2 Controls. 

ST models are supplied without controls.  
 

1.3 Dimensions 
 
 

 

 

 

 
 

 

 

 

  

ST 1500/2000  ST 2500/3000

 Connection 

sizes 

 

 

1 Inlet 

2" 2" 

2 Outlet 

2" 2" 

3  

 

 

4  

 

 

5 Anode 

3/4 3/4 

Recirculation 
connection 

1¼" 1¼" 

7  

 

 

8 T&P 

connection 

3/4 3/4 

A Tank 

diameter 

1100 1400 

B Overall 

diameter 

1200 1500 

C Height 

1930/2118 1990/2118 

D  Height  alt inlet 

400 480 

Distance 
between 2 “ 
connections 

550/644 500/565 

 Height 
circulation conn. 

710 690 

height clean out 
opening 

450 530 

H Height 

inlet 

135 183 

Clean out 
diameter 

110 110 

Clean out flange  

1 Cold water inlet/drain 2”

6 Recirculation 1¼”

5

2 Hot water outlet 2” 

 
 
 
 
 
 
 

 

 

3

Summary of Contents for ST 1500

Page 1: ...s water heater please read the installation instructions An authorized installer must install the heater and commission it according to the local valid requirements A O SMITH CANNOT ACCEPT ANY RESPONS...

Page 2: ...hutting down 7 2 5 Maintenance 7 2 5 1 Anode 7 2 5 2 Descaling 7 2 6 Spare parts 8 3 FOR THE END USER 3 1 Filling the heater 8 3 2 Start up of the water heater 8 3 3 Shutting down 8 3 4 Maintenance 8...

Page 3: ...laceable insulation jacket minimizes heat loss 1 2 Controls ST models are supplied without controls 1 3 Dimensions ST 1500 2000 ST 2500 3000 Connection sizes 1 Inlet 2 2 2 Outlet 2 2 3 4 5 Anode 3 4 3...

Page 4: ...lations and codes Location needs to be chosen to prevent damage in case of tank leakage e g place tank in a drain pan or near a floor drain of sufficient capacity For mounting of the jacket see separa...

Page 5: ...tion pump sanitary water 6 temperature sensor for boiler three way valve A circulation line B warm water C cold water E boiler water hot F boiler water return Optional backup elements are available fo...

Page 6: ...ined by the quality and quantity of the water flowing through the heater Therefore we recommend the anodes to be checked regularly preferably simultaneously with an internal inspection of the glass li...

Page 7: ...Filling the tank 1 Check if drain valve is closed if mounted 2 Open the cold water tap to the heater and all hot water outlets in order to bleed all air from the system The heater is filled when cold...

Page 8: ...have been met a The tank is installed in accordance with A O Smith s installation instructions for that specific model as well as the local installation and building regulations and all relevant rule...

Page 9: ...ectively A O Smith is not liable for carriage labor installation and other costs relating to the replacement 4 6 Claims Any claim under this warranty must be filed with the dealer who originally sold...

Page 10: ...tents of flange kit Bag A Flange plate Designation Quantity Bolts 6 Gasket 1 Flange plate 1 Bag D 1 Bag D Flange collar and cover fixation screws and brackets Designation Quantite Brackets 3 Parker sc...

Page 11: ...e tank Mounting of the flange covers and jacket MUST be done in the indicated sequence For further information please refer to the installation manual 0307138RO Bag D fixing bracket for clean out coll...

Page 12: ...ible jacket Install the flexible jacket before mounting the clean out collar and cover The collar serves as mould to cut the required opening in the jacket In case the zipper is difficult to close it...

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