Potable Water and Space Heating

Fig. 9: Single Domestic Hot Water Heater and Storage

Tank

NOTE: If local codes require a vacuum relief valve, acquire one locally and install per valve manufacturer’s instructions.

CAUTION: When this heater is used for both potable water and space heating, observe the following to ensure proper operation.

1.All piping materials and components connected to the water heater for the space heating application shall be suitable for use with potable water.

2.Toxic chemicals, such as used for boiler treatment, shall not be introduced into the potable water used for space heating.

3.If the heater will be used to supply potable water, it shall not be connected to any heating system or components previously used with a non-potable water heating appliance.

4.When the system requires water for space heating at temperatures higher than 140°F (60°C), a means such as a mixing valve shall be installed to temper the water in order to reduce scald hazard potential.

Fig. 10: Multiple Boilers — Reverse Return,

Primary/Secondary Piping with Indirect DHW

Model		Soft (0–4 grains per gallon)				Medium (5–15 grains per gallon)
No.	∆T	gpm	∆P	MTS	SHL	∆T	gpm	∆P	MTS	SHL
300	30	19	8	1.5	10	20	28	17	1.5	20
500	30	31	7	2	8	20	47	16	2	18
850	30	53	17	2	20	20	80	40	2	46

∆T = Temperature rise, °F.

∆P = Pressure drop through heat exchanger, ft.

SHL = System head loss, ft (based on heater and tank placed no more than 5 ft apart and equivalent length of 25 ft of tubing). gpm = Gallons per minute, flow rate.

MTS = Minimum tubing size.

CAUTION: For scale free operation with Medium water (5–15 grains per gallon of total hardness), the operating control must NOT be set higher than 130°F. For higher than 130°F operation, or Hard water (>16 grains per gallon of total hardness), a water sof- tener/treatment system must be utilized.

Table H: Domestic Water Heater Flow Rate Requirements

300, 850 specifications

Raypak is a renowned name in the heating industry, particularly known for its high-quality pool and spa heaters. Among their extensive product line, the Raypak 850, 500, 300, 400, and 700 models stand out for their reliability, efficiency, and cutting-edge technologies. Each model is designed to cater to different needs and applications while maintaining Raypak’s commitment to performance.

The Raypak 850 is designed for larger commercial pools or residential setups requiring high output. With a powerful heat exchanger made from copper and bronze, it ensures superior heat transfer and longevity. Its digital control system provides precise temperature regulation, enhancing user experience. Moreover, it features a durable construction with weather-resistant materials, ensuring lasting performance in various environments.

The Raypak 500 model offers a balance between efficiency and compactness. It features eco-friendly technology that reduces energy consumption without sacrificing performance. The integrated thermostat allows users to maintain consistent water temperatures, making it ideal for residential pools. This model is well-regarded for its user-friendly digital display, simplifying operation and monitoring.

For those needing a more moderate capacity, the Raypak 300 is an efficient choice. It combines robust engineering with an easy-to-use interface. Its advanced ignition system improves reliability while minimizing energy waste. The Raypak 300’s compact design allows for easy installation in various spaces, making it an excellent option for smaller pools.

The Raypak 400 heats water quickly and efficiently, making it suitable for both residential pools and spas. It features a high-capacity heating system that ensures optimal performance. With a clear LED display, users can easily monitor their settings, while the integrated diagnostics provide real-time feedback for maintenance and troubleshooting.

Lastly, the Raypak 700 model is known for its versatility and robust performance. It is equipped with advanced safety features, including a high limit switch and water flow detection mechanism, to ensure safe operation. The model's energy-efficient design enhances its eco-friendliness, making it a popular choice among environmentally conscious users.

Collectively, these Raypak models exemplify superior engineering, performance, and user-friendliness. Their innovative features ensure that they meet the varied demands of pool owners while providing reliable heating solutions for leisure and relaxation. Whether for commercial or residential use, the Raypak 850, 500, 300, 400, and 700 offer unmatched quality and efficiency.