pangleixixi的部落格

Since the demand system only runs for Copper water pipe a few seconds whenever someone demands hot water, it uses very little energy for pumpingtypically less than 2. When the temperature drops to 85 degrees the pump turns back on and the cycle repeats. The demand pumps, like the Laing pump, are placed under a fixture where they connect the hot and cold water lines. This keeps hot water near all the fixtures in the home with just one pump. Another advantage is the much smaller installation cost. The Laing autocirc is not suitable for use with a tankless water heater. They waste huge amounts of energy keeping hot water in the pipe, and decrease the life of the water heater. Its easy and economical to retrofit to any house. When hot water reaches the valve, the valve closes.00 a year. One large advantage is the reduction in energy usage. The demand system has several advantages over the traditional system, and saves the same amount of water. When each valve is cold water can flow from the hot line to the cold, and does so because the pump at the water heater outlet is providing pressure. They are inappropriate for tankless water heaters. Demand system pumps are more powerful than the other types of systems to move the water quickly. It is a small pump that mounts under the sink, and pumps water from the hot water pipe into the cold water pipe, and when hot water reaches 95 degrees, the pump shuts off. It stops running when hot water reaches the fixture, and so it doesnt use any more hot water than what you would normally use without a circulating system. Most of the circulating pumps wont pump enough water to activate the tankless heaters.Residential hot water circulating systems provide the user with fast hot water providing a convenience for the user, and saving the water that would have been run down the drain. Demand systems have more powerful pumps than the other systems and so the Chilipepper pump and at least one of the larger Metlund pumps will work with tankless water heaters. This system uses a lot of energy since it keeps the plumbing full of above ambient temperature water, and the cold water line ends up with tepid water not cold. When the pump is activated by the user pushing a button, it pumps water out of the hot water pipe and into the cold water pipe, and shuts off when the hot water reaches the pump. Laing makes a system suitable for retro-fitting to existing homes that dont have a dedicated return line, called the Auto Circ. A pump circulates the hot water through the loop. Traditional hot water circulating systems form a loop with the hot water piping that connects from the water heater outlet to the fixtures, and then back to the water heater. Metlund and Chilipepper make demand hot water systems. Traditional circulating systems are made by Grundfos, Taco, Bell & Gusset, and others. These systems provide nearly instant hot water at each fixture, but they are very expensive to operate. . Demand hot water systems are residential hot water circulating systems designed to work without a dedicated return, and are suitable for retrofit to existing homes. They also use the cold water piping for a return line. The valves are connected between the hot and cold water lines. Grundfos makes a similar hot water circulating system for retrofitting into homes that dont have a dedicated hot water return line. The system is not suitable for use with a tankless water heater. The pump can handle several fixtures if the plumbing layout is correct. However, like the Laing Autocirc, it doesnt really deliver hot water, just luke warm, and it replaces the cold water with tepid. A pump connects to the outlet of the water heater, and a thermally controlled valve is placed at each fixture in the home