title 24 water heater example

Water Heater in Title 24: What You Need to Know?:

Title 24 is a set of Building energy efficiency standards for buildings in California. It covers various aspects of building design and construction, such as insulation, lighting, windows, and water heating.

One of the major components of Title 24 report is the water heating system, which typically provides hot water for uses such as bathing, cleaning, cooking, and space heating.

Depending on the type and size of the building, different water heating systems may be required or recommended by Title 24 Energy Calculations and may requires a HERS Testing. In this article, we will focus on the water heating standards for residential buildings, which include single-family homes, multifamily buildings, and accessory dwelling units (ADUs).

Types of Water Heating Systems

There are many types of water heating systems available in the market, each with its own Pros and cons. Some of the common types are:

Solar water heaters

    • Storage water heaters: These are the most traditional and widely used type of water heaters. They consist of a tank that stores hot water and a burner or heating element that heats the water.
      Storage water heaters are devices that heat and store water for on-demand use. They can use gas, electricity, or oil as fuel sources and have different efficiency standards based on their tank size.
      Gas water heaters have a small flame, a heating element, a pipe, and a control. Electric water heaters have a resistance heating element and can be grid-enabled for demand response programs. Electric water heaters are not allowed by the prescriptive method of Title 24 compliance but can be used with the performance method.
    • Tankless water heaters: These are also known as on-demand water heaters or instantaneous water heaters. They do not have a storage tank, but instead, heat the water as it flows through a heat exchanger when a hot water faucet is turned on. many ADU in California Depends on Tankless water heaters.
    • Tankless water heaters can provide continuous hot water without wasting energy on standby losses. However, they may have a limited flow rate and require higher installation costs. Tankless water heaters come in two types: Tankless water heater electric and Tankless water heater gas.
    • Heat pump water heaters are electric water heaters. They use a compressor to transfer heat from the air to the water tank. It also includes fans, storage tanks, pumps, controls, and backup electric resistance elements to ensure hot water delivery in different conditions.
      The performance of HPWHs depends on the storage water temperature, the inlet air temperature, and the hot water demand.
      HPWHs are more efficient in warmer climates and locations, but they can still save energy in colder areas compared to conventional electric resistance water heaters. If the HPWH is installed in a confined closet, it may need ducting to discharge exhaust air and prevent overcooling of the air, which can reduce its efficiency.
    • Indirect water heaters: These are a type of storage water heaters that use a separate heat source to heat the water in the tank.
    • Integrated water heaters: These are a type of combination systems that provide both space heating and water heating in one unit. They can use a variety of technologies, such as condensing gas boilers, heat pumps, or solar thermal systems. Integrated water heaters can save space and energy by reducing the need for separate systems. However, they may have higher upfront costs and require proper sizing and maintenance.
    • Solar water heaters use solar collectors to capture the sun’s energy and heat water in a storage tank or heat exchanger. They are a type of renewable energy system. Solar water heaters can reduce energy consumption and greenhouse gas emissions by using free and clean solar energy. However, they may have higher upfront costs and require backup systems for cloudy days or periods of high demand.

Contact Title 24 Calcs to obtain a Title 24 Certification cost and discuss your project.