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Seaward 

Products 

WATER HEATERS 

OWNER’S MANUAL 

FOR ELECTRIC 

HEAT EXCHANGER 

WATER HEATERS 

20 GALLON 

 VERTICAL 

MODELS: 

S1800, S1850, S1900, S1950 

Summary of Contents for S1800

Page 1: ...Seaward Products WATER HEATERS OWNER S MANUAL FOR ELECTRIC HEAT EXCHANGER WATER HEATERS 20 GALLON VERTICAL MODELS S1800 S1850 S1900 S1950 ...

Page 2: ...eater may result in excessively hot water This water heater tank and heat exchanger is made of aluminum Some engine manufacturers recommend that the cooling system be flushed periodically Caustic chemicals are commonly used DO NOT flush caustic chemicals such as Nalcool through your system with the heat exchanger hooked up or damage WILL occur to the heater If flushing is required by your engine m...

Page 3: ...water system 4 The temperature pressure valve may weep during initial installation operation This is normal The valve will seat itself with use NOTE Do not operate water heater without element be submerged in water MAINTENANCE 1 Check heat exchanger lines for leaks at regular intervals A leak in the system will cause coolant loss and may damage engine 2 Flush tank periodically to help prevent buil...

Page 4: ... below the structural floor and cannot contact any live electrical part Install replacement temperature and pressure protective equipment required by local codes but not less than a combination temperature and pressure relief valve certified as meeting the requirements for relief valves and automatic gas shutoff devices for hot water supply systems ANSI Z21 22 by a nationally recognized testing la...

Page 5: ...the limit switch activates proceed as follows Turn power off at main power panel or remote switch Remove wiring access cover Depress red button on high temperature limit switch Replace cover and turn power on If temperature limit switch reactivates contact a Seaward Products authorized service center ...

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