Pressurized solar water heaters are a type of solar water heating system that uses solar energy to heat water and a pump or other mechanical device to pressurize the water. These systems typically consist of a solar collector, a storage tank, and a circulation pump.

The solar collector is usually a flat-plate or evacuated tube collector that absorbs solar radiation and converts it into heat. The heat is then transferred to a fluid, usually water or a water-glycol mixture, which circulates through the collector and into a heat exchanger in the storage tank.

The storage tank is typically insulated to reduce heat loss and can be either a pressurized or non-pressurized tank. Pressurized tanks have a built-in pressure relief valve and are designed to maintain constant pressure, which allows for higher flow rates and greater flexibility in system design.

The circulation pump is used to move the heated water from the collector into the storage tank and to circulate the hot water to the point of use. In pressurized systems, the pump is also used to maintain the pressure in the tank and to ensure a steady flow of hot water.

Pressurized solar water heaters are generally more efficient than non-pressurized systems, as they can provide a higher flow rate and better heat transfer. They are also more expensive and require more maintenance than non-pressurized systems, due to the additional components and complexity of the system.

1. Domestic hot water: Pressurized water heaters can be used to provide hot water for residential or commercial buildings. They are particularly useful in areas with high hot water demand, as they can maintain a constant supply of hot water at high flow rates.
2. Swimming pool heating: Pressurized water heaters can be used to heat the swimming pool water. They are often more efficient than traditional electric or gas pool heaters, and can significantly reduce energy costs.
3. Industrial process heating: Pressurized water heaters can be used in various industrial processes that require hot water, such as food processing, chemical manufacturing, and textile production. They are often more efficient than other heating systems and can help reduce energy costs.
4. Agricultural applications: Pressurized water heaters can be used in various agricultural applications, such as greenhouse heating and livestock watering. They can provide a reliable and cost-effective source of hot water in remote locations or areas with limited access to electricity or gas.
5. Solar water heating: Pressurized solar water heaters are a popular option for residential and commercial buildings that want to reduce their reliance on fossil fuels. They use solar energy to heat water and a pump or other mechanical device to pressurize the water, providing a sustainable and efficient source of hot water.

Glass-lined inner tanks are commonly used in water heaters, particularly in electric and gas storage tank models. The inner tank is coated with a layer of glass, which provides several benefits, including:

1. Corrosion resistance: The glass lining protects the metal tank from corrosion caused by exposure to water and chemicals, such as chlorine and sediment. This extends the life of the water heater and reduces maintenance costs.
2. Improved hygiene: The smooth and non-porous surface of the glass lining prevents the buildup of bacteria and other contaminants, improving the hygiene and safety of the hot water.
3. Energy efficiency: The glass lining helps to retain heat inside the tank, reducing heat loss and improving energy efficiency. This means the water heater can maintain a higher temperature without using more energy.
4. Better water quality: The glass lining helps to prevent the water from absorbing any metallic tastes or odours from the tank, resulting in better-tasting and better-smelling hot water.

Overall, glass-lined inner tanks are an effective and popular choice for water heaters, providing a durable, hygienic, and energy-efficient solution for hot water storage.