S U F S E R V I C E H A N D B O O K

Q U E S T I O N S A N D A N S W E R S

QUESTIONS AND ANSWERS

Q.How much electrical power is required for a SUF water heater?

A.The SUF models draw approximately 5.0 Amps Max.

Q.When should SUF’s be delimed?

A.Many variables affect the lime build up process including:

•Water temperature — the amount of lime accumulation during the same period of time will be nearly 2 times great if water is stored at 140 degrees F than at 120 degrees F. A 180° setting may accumulate seven times more lime — in a period of time — than at 140° setting.

•Volume of water — the more gallons flowing through the SUF, the more rapid the accumulation.

•Hardness — the harder the water the quicker lime build up occurs. 1 to 3.5 grains per gallons is “soft”, 3.5 to 7 grains per gallon is “moderate”, 7 to 10.5 grains per gallons is “hard” and 10.5+ grains per gallon is “very hard”. (An aspirin is about 5 grains. One grain is equal to 17.1 parts per million.)

A.Deliming should be done when a slight rumbling or popping sound is detected when the main burner is on. Check for accumulation through the clean-out opening.

Q.What effect will lime build-up have on the SUF water heater?

A.One eighth inch of scale buildup on the heat exchanger may reduce efficiency as much as 22%; a ¼ inch buildup, as much as 38%.

Less efficient heat transfer means more heat exchanger expansion/contraction stress and pre- mature leakage.

Because the heat transfer to the water is made through a (relatively) small diameter, coil type exchanger tube, expansion and contraction as well as the shape of the exchanger greatly reduces buildup on the heat transfer surface. The bottom of the tank should be checked for dislodged accumulation.

Q.Anode rods (4) provide additional protection against corrosion. When should these be replaced?

A.When large gouges or pits appear in the anodes, replace them.

Q.How often should the anodes be inspected?

A.Approximately every six months.

Technical Training Department

38

State Water Heaters

STC-077

Ashland City, Tennessee © 2004

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State Industries STC-077 Questions and Answers, When should SUF’s be delimed?, How often should the anodes be inspected?
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STC-077 specifications

The State Industries STC-077 is a notable addition to the realm of high-efficiency water heaters, exemplifying advanced engineering and innovative design. The STC-077 is particularly recognized for its exceptional performance and energy-saving capabilities, making it an ideal solution for both residential and commercial applications.

One of the standout features of the STC-077 is its impressive energy efficiency rating. Utilizing state-of-the-art technology, this water heater operates with a high energy factor (EF) that significantly reduces operating costs compared to traditional water heating systems. This is especially beneficial in today's climate of rising energy costs and increased environmental awareness.

The STC-077 employs a robust stainless-steel tank construction that not only provides durability but also mitigates the risk of corrosion, ensuring longevity and reliability. This innovative design approach helps extend the product's lifespan while maintaining consistent performance throughout its use. Coupled with superior insulation, users can expect minimal heat loss and enhanced energy efficiency, making it a sustainable choice for consumers.

The unit is equipped with advanced controls that provide precise temperature regulation. This feature improves user experience and safety, allowing for customization to meet individual needs. Additionally, the STC-077’s intuitive digital display makes monitoring and adjusting settings straightforward, providing convenience and ease of use.

In terms of capacity, the STC-077 offers versatility with options suitable for various household sizes and demands. Whether for a small apartment or a busy commercial establishment, its modular design allows for seamless integration into existing systems while providing adequate hot water supply.

Furthermore, the STC-077 incorporates innovative technologies aimed at reducing maintenance needs. With easy access for servicing and built-in diagnostics, users can monitor performance proactively, ensuring the unit operates at optimal efficiency.

Overall, the State Industries STC-077 shines as a forward-thinking water heater. Its combination of high energy efficiency, durable construction, advanced technology, and user-friendly features make it a comprehensive solution for those seeking reliable hot water with minimal environmental impact. Whether for homeowners looking to lower energy bills or businesses seeking dependable performance, the STC-077 stands out as a premier choice in water heating solutions.
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