M.BOILER PIPING, DOMESTIC HOT WATER (DHW) APPLICATION – The V9A boiler can be used in many different piping applications to produce Domestic Hot Water (DHW). In some applications, depending on the control strategy (outdoor reset, setpoint operation, etc.) and size of boiler, it is recommended to isolate the space heating load from the DHW load. For example, if the domestic load is more than the space heating load, it is beneficial to dedicate one or more boilers solely to DHW production and one or more other boilers to solely space heating, since during mild weather conditions, the boiler(s) will have more capacity than is required. Piped in the recommended manner, the space heating boiler(s) can be shut down during the summer months to conserve energy and to avoid short cycling. This section

will address four methods of piping and controlling domestic hot water generation.

1.Hot Water Boiler/Tankless Coil(s) - Tankless coils, mounted into the side of the boiler, have been used successfully for many years and may be used in single and multiple boiler applications. When a boiler is arranged with tankless coils, it is not recommended that outdoor reset be used, unless there are control systems in place to prevent overheating of the space heating zones.

Figure 37a depicts the addition of an automatic mixing valve to the tankless heater piping to obtain a dual temperature domestic system. The mixing valve provides tempered water to the fixtures, while the branch prior to the valve provides high temperature water for dishwashing, washing machines and other appliances.

2.Hot Water Boiler/Tankless Coils/Storage Tank - This application involves the use of several tankless coils piped in parallel, emptying into a large storage tank, and is typically used in larger DHW production

applications, such as hotel showers and laundries. See Figure 37b for recommended piping and wiring details for this type of application. The tempering valve and recirculation loop are advantageous in these applications, because they provide both high temperature and tempered domestic hot water to the system, eliminating the need to purge and waste water until it reaches the desired temperature. In the case where the boiler is used for domestic production only, and there is no space heating involved, a destratification pump is utilized to provide flow within the boiler. This flow acts as a means of preventing the hot water from stratifying at the top of the boiler. Destratification pump flow rates are given in the table in Figure 37b.

3.Hot Water Boiler/Indirect Water Heater - The use of indirect water heaters for domestic hot water generation is common and somewhat advantageous over tankless coils alone, since they also provide DHW storage. A tempering valve and recirculating pump are again recommended for a dual temperature system, to provide a constant temperature to the fixtures without waiting for cooler water to warm up. Figure 37c shows a typical indirect heater piping application with no space heating. Indirect pump flow rates are calculated based on a 20°F ΔT.

NOTICE

DO NOT use the boiler circulator as an indirect domestic hot water system circulator.

4.Steam Boiler/Indirect Water Heater – Consult I=B=R Installation and Piping Guide No. 200. Use the Indirect Water Supply tapping, “R” (Special Order Only – see Figure 24) when connecting an Indirect Water Heater directly to the boiler.

NOTICE

When possible, domestic hot water production should utilize a dedicated boiler(s). This will allow the other boiler(s) to be shut down and isolated during the summer months. If the boiler load is shared between heating and domestic hot water, then one needs to determine if a hot water priority is required. If a priority is not selected, erratic domestic hot water production may result during the beginning and end of every heating season. Conversely, a priority for domestic hot water production may cause a significant heating zone activation delay, in an improperly balanced system. Parallel piping conversions may require isolation from the heating system to prevent system flow influence on DHW performance. Consult a qualified system heating professional to design for the proper application.

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Burnham V9A manual
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V9A specifications

Burnham V9A is a well-established model in the world of cast iron boilers, renowned for its efficiency and reliability in residential heating applications. As a part of Burnham's esteemed line of heating solutions, the V9A is designed to provide homeowners with consistent warmth while prioritizing fuel economy and ease of use.

One of the defining features of the Burnham V9A is its durable cast iron construction. This robust material enables the boiler to withstand high temperatures and pressures, ensuring a long service life. The V9A is engineered with several sections that are joined together, allowing for easier maintenance and potential adaptability to various heating demands. The boiler's design also promotes excellent heat retention, which not only enhances performance but contributes to overall energy efficiency.

In terms of technology, the Burnham V9A stands out with its advanced combustion design. With an efficiency rating of up to 85%, this model maximizes the heat output while minimizing fuel consumption. The boiler is compatible with both natural gas and propane, providing flexibility for users to choose their preferred fuel source. Additionally, the V9A is designed to operate with a minimum of venting requirements, making installation simpler and more cost-effective.

The Burnham V9A also features a choice of various firing rates, allowing homeowners to select the optimal heating output for their specific needs. This versatility ensures that the boiler can be effectively sized for different home environments, making it a highly adaptable option for a broad range of residential settings.

Moreover, one key characteristic of the Burnham V9A is its user-friendly control systems. It comes equipped with reliable electronic ignition and offers options for outdoor reset controls, which enhance efficiency by adjusting the boiler's operation based on the outdoor temperature. This advanced control capability not only optimizes energy use but also enhances comfort levels in the home.

Overall, the Burnham V9A represents a balance of durability, efficiency, and modern convenience, making it a top choice for homeowners seeking a reliable heating solution. Its combination of cast iron construction, advanced technology, and user-friendly features solidify its reputation in the competitive market of heating systems, ensuring comfort and peace of mind for years to come.
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