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Hot Water Guy Blog
Miscellaneous Engineering Data
Articles about tankless water heaters, pros & cons, installation, behavior.
Tankless water heater articles that discuss how they work, what to expect from
them, the importance of proper installation, using them with demand hot water
systems water and energy conservation aspects, cost to operate, potential
savings and more.
Tankless water heaters, often mistakenly referred to as instant water
heaters, do not instantly heat water. Heating water takes time. The
tankless unit heats it much more quickly than a storage heater but it still
takes time. Tankless water heaters have pros and cons, as do most
appliances. They can provide energy savings and unlimited hot water but
they are also expensive and have some interesting operating characteristics.
Because tankless heaters don't have a tank, there is no continuous heat (energy) loss from the large volume of stored hot water, as there is with a tank type heater. Typically tankless heaters do not have standing pilot lights like tank type unit unusually have which saves more energy.
A tankless water heater takes longer to get hot water with than with a storage tank type water heater. Typically tankless water heaters take 10 to 20 seconds longer to get hot water to the fixtures. But you can turn it green! Install a hot water demand system.
While tankless hot water heaters do provide an unlimited supply of hot water they are not problem free. Almost everyone is familiar with tank-type water heaters, with a big tank of hot water ready and waiting. The water can be heated with flames, electric elements, or any other method. Storage heaters have two basic problems; they use more standby energy than tankless water heaters, and you can run out of hot water.
While it’s true that tankless water heaters save
energy and can provide an endless supply of hot water, it’s also true
that tankless units take longer to get the hot water to the fixtures.
Since a tankless heater needs to heat the water before it can deliver
hot water to you, you have to wait longer. The only way to get the hot
water of course is to run the faucet. So while you run the faucet and
wait, you are dumping gallon after gallon of pure clean water down the
drain. Water that required energy for pumping and treating it. Pumping
and treating the water uses energy which in turn means green house
gasses being released into the atmosphere.
Most of us have grown up with a standard tank type water heater. We are used to the way
that our hot water heater and plumbing
works. Changing over to a tankless water heater may dramatically change the way
you use your hot water. With a tank type heater when you turn on a hot
water faucet the hot water, begins
flowing to the faucet. With a tankless system the water that begins
flowing is cold and gradually comes up to temperature as if passes through the
heat exchanger. So with a tankless heater it takes a little longer to get hot
A Product Review & Comparison. If you aren't familiar with the operation
of a tankless water heater, then there are some things you might want to know before you make that purchase. There are major differences between the way tank type
water heaters provide you with hot water, and the way a tankless heater does.
This article draws the conclusion that tankless water heaters don't typically save much money over the lifetime of the heater. The installation costs of tankless water heaters is so high that it is difficult to save much money. Tankless water heaters can be a good solution for some situations, but for people it's not the best way to go.
Correctly choosing size of your tankless heater is probably the most important aspect of the purchase. If your tankless gas water heater is too small or too big it will create headaches for you in the future.
Water heater companies, both tankless and storage, recommend sizing water
heaters for multiple fixtures running at once. Large families might find it desirable to be able to have two
showers going at once and maybe a sink too, but I think most families
don't need a water heater big enough to fill a hot tub, or to run three fixtures
Flow Rate Calculation for Hot
Water Residential Plumbing Layouts with and
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