The cost of the energy will far outweigh any monetary savings from water conservation. Some of these pumping systems use small pumps that pump water very slowly, and are temperature controlled. By continuously pumping water through the loop you have instant hot water at every fixture. The Lang Auto-Circ and The Grundfos Comfort System are two such systems, and the Hot Water Lobster is another.00 per year in electricity costs. Unfortunately these tepid water systems consume a lot of energy since you are heating that big loop of piping and return line and its surroundings. I think they should be honest and call them Instant Tepid Water Systems. Traditionally, if you had a hot water circulating system, it meant that you had a hot water pipe that ran in a big loop from the outlet of the water heater to each fixture one after the other, and then back to the inlet of the water heater through a small pump. Hotels and motels have hot water circulating systems; otherwise it could take hours to get hot water with such long pipes as they have. There are a number of manufacturers producing hot water circulating systems that utilize the cold water line as the hot water return line. Speed up your hot water with a hot water circulating system. Hot water is not being circulated. . Some models of the Metlund system will run tankless water heaters, and some wont, so be sure to inquire before you make a purchase. When the user turns on the pump it runs until hot water reaches the fixture and then the pump automatically shuts off. With the demand system the energy consumed is no more than if the user just ran the tap as normal. The Chilipepper will run any tankless water heater. Most folks dont really want the cold water pipe full of warm or tepid water. These systems only pump the water to the fixture when hot water is demanded by the user. The pumping costs are small; typically demand systems use less than 2. Choose the type of system that best suits your needs and enjoy the added convenience of quick hot water while being kind to the planet. You dont get Instant Hot Water as the manufacturers claim. However, instant hot water is also very expensive. The Hot Water Lobster doesnt have a pump, but relies on the fact that hot water rises, and the Lobster valve has to be substantially higher than the water heater for the system to work. Another class of systems that use the cold water line as the return line is the Hot Water Demand Systems. This is very convenient. It seems to take forever for the water to get hot. The water is pumped more quickly than if you ran the faucet full throttle. The pump turns on when the water temperature drops below a set point, and then shuts ABS series off when the water temperature in the pipe reaches another set point. The cost of heating the water is considerably more than the cost to run the pump.Have you ever had to stand shivering in the cold morning air waiting for hot water with your arm outstretched, fingers extended into the cold stream of water. The water is warmer near the water heater and colder the further you get from the water heater, but it is tepid through out the piping system. The cold water line does not end up full of warm water. And since the hot water is not being circulated it does not affect the life of your tankless water heater or the warranty. This keeps the water your entire piping system full of luke-warm water. You save time, water, energy, and money! There are at least three manufacturers of demand systems, Metlund, RedyTemp, and Chilipepper. This is because they run for such a brief time, typically less than 1 minute per use. Not only do you have to pay for the energy to run the pump continuously for long periods of time or even full time, but you also have to pay for the heat energy being radiated into the environment from that big loop of hot water piping. The RedyTemp will not work with a tankless water heater
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