Bosch Tankless Water Heaters Reviews

Plan to purchase a tankless hot water heater? If so, and if you aren’t familiar with how a tankless heater operates, then there are some things you should know about before you make that purchase.

There are some big differences between the way tank type water heaters and tankless heaters interact with you the user as you operate your hot water system. With a tank type hot water heater, when you turn on the faucet and the hot water begins flowing through the hot water piping on its way to your faucet. Since the piping is cold, it absorbs a portion of the heat in the water, gradually warming up to the temperature of the water.

This is why your hot water gradually goes from cold to hot if you leave your hand under the running water. If your pipe run is short, the warm-up will be faster. The longer the pipes and the heavier the piping material, the more gradual will be the warm-up because the pipes will absorb more heat from the flowing water.

Another significant variable in the warm-up time is the velocity at which the water is traveling. The more quickly the water flows, the quicker the warm-up. The higher the water velocity, the less time it is exposed to the cold piping material. The ambient temperature is also a big factor. If your pipes are in the attic, and you are in Bakersfield California, in mid summer, your pipes will be so warm that they won’t absorb any heat from the water.

However, if you are in Truckee California in January, your pipes will take far longer to warm up, and with very long pipe runs with un-insulated pipes, the high temperature might never be reached since the heat loss from the pipes to the surrounding air might be quite high.

Within a short time the Geen warm water the temperature stabilizes. Since you have a tank filled with plenty of hot water that is at one temperature, the temperature at your faucet vary very little, even when you change the flow rate with the faucet. A tiny stream of water is basically the same temperature as with the faucet flowing at full stream.

Now let’s see how things change with a tankless heater. The previous warming-up factors apply and there are a few more things that come into play. When you turn on the hot water faucet there is no big tank of hot water to start flowing to the fixture. There is, however, a tankless heater full of cold water that begins passing through the hot water piping on its way to your sink.

Heating the water to full temperature requires that the cold water entering the heater travel all the way through the heater. This will causes a longer delay in getting the hot water to the fixture, and results in running more water down the drain while waiting than with a tank type heater.

An easy way to visualize the workings of a tankless heater is to picture a coil of copper pipe with a fire in the middle of it. As the water travels through the tubing it absorbs heat from the flames and gets hotter and hotter. An electric heater is similar but instead of fire the water flows over heating elements.

The temperature of the water coming out of the water heater depends on flow rate and what the incoming cold water temperature is. If your cold water is 45 degrees, and the heater is heats the water 90 degrees with a flow rate of 1 gallon per minute, then you will obtain 135 degree water at the outlet.

If for any reason the water temperature of the incoming cold water rises to 55 degrees, then outlet temperature will rise to 145 degrees. In most areas this will result in a different hot water temperature in the summer than in the winter months.


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