Water Quality and Scale

A complete water analysis and an understanding of system requirements are needed to protect the on-demand water heaters and water heating systems from scale. Water analysis shows whether water is hard or soft. Hard water, unless treated, will cause scaling or liming of the heat exchanger. The rate of scaling increases with temperature and usage because calcium carbonate and other scaling compounds lose solubility (fall out of solution) at higher temperatures. For example, for every 20°F over 140°F, the rate of scale increases by a factor of 2 (See figure below). Reference target water quality levels found in the operation / installation manual and consider water treatment if these levels are exceeded. *

LIME DEPOSITED, lb/yr

210

180

150

120

90

60

30

0

BASED ON 10 grains/gal HARDNESS *

180°F

170°F

160°F

 

 

 

 

 

 

 

150°F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

140°F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

120°F

300 0

900

1500

2100

2700

3300

3900

WATER USAGE, gal/day

Figure “3

*Source 2003 ASHRAE Handbook HVAC Applications

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A.O. Smith 505 Series 100, 705 Series 100, 305 Series 100, 186965-001 manual Water Quality and Scale, Lime DEPOSITED, lb/yr

705 Series 100, 186965-001, 505 Series 100, 305 Series 100 specifications

A.O. Smith is a leading manufacturer of water heaters and has long been recognized for its commitment to innovation and quality. Among their diverse product lineup, the 305 Series 100, 505 Series 100, 186965-001, and 705 Series 100 models stand out as reliable solutions for both residential and commercial water heating needs.

The A.O. Smith 305 Series 100 is known for its impressive energy efficiency. Utilizing advanced insulation technologies, this model minimizes heat loss, ensuring that water remains heated for longer periods. It features a durable tank construction, often built with glass-coated technology that prevents corrosion and extends the lifespan of the unit. This series also comes equipped with a user-friendly digital thermostat, allowing homeowners to set the desired temperature easily.

On the other hand, the 505 Series 100 emphasizes capacity and performance. Designed to supply hot water for larger households or commercial settings, this model boasts a high recovery rate, which means it can heat water quickly even during peak usage times. Its robust heating element and energy-efficient design ensure significant savings on energy bills, making it a smart investment. This series also includes safety features, such as a thermal relief valve, protecting against overheating.

The A.O. Smith 186965-001 model is particularly notable for its compact design. Ideal for installations with limited space, it does not compromise on performance. This model often includes smart technology, enabling remote monitoring and control via mobile apps. This feature allows users to track water usage, receive maintenance alerts, and manage settings from anywhere, enhancing convenience and ensuring the unit operates at optimal levels.

Lastly, the 705 Series 100 exemplifies versatility and high efficiency. With options for both gas and electric heating, it accommodates a wide range of consumer needs. It incorporates advanced safety elements, such as flame arrestors and high-temperature limit switches, which prioritize user safety. Additionally, the 705 Series is designed for easy installation and maintenance, enabling homeowners to enjoy peace of mind.

In summary, the A.O. Smith 305, 505, 186965-001, and 705 Series 100 all exemplify the brand's dedication to engineering excellence. With their unique features, cutting-edge technologies, and design characteristics, these models cater to various heating needs, delivering reliable hot water solutions for homes and businesses alike.