As is well advertised, tankless water heaters save energy. The savings come from the fact that the tankless water heaters do not have a tank full of water slowly leaking out heat all day and all night. Another factor for gas water heaters is the tankless units don’t having standing pilot lights. Actually some do, but most don’t. Even so, we are not talking about a very large amount of energy.
One of the advertised benefits is endless hot water. Take as long a shower as you like, you will never run out. However, there is a price to be paid. Suddenly you are not actually saving energy, but using more energy with that longer shower. Human nature being what it is, many families actually spend more money on heating water after switching to a tankless water heater.
As for those folks interested in conserving water, tankless water heaters are not a friend. It takes longer to get hot water from a tankless unit than a storage type water heater because when you turn on the tap with a storage heater the hot water immediately flows into the pipe and off to the tap. But with the tankless unit, there is no hot water ready and waiting to flow off to the tap, all the water in the system is cold. So first the water must be heated by the tankless heater and then make it to the tap. Not only does it take considerably longer to get hot water to the sink, but it warms up much more gradually than with a storage type water heater. This means you are running more water down the drain while you are waiting for the hot water to reach the fixture, and finally stabilize at the desired temperature.
There is a fix; a demand type hot water pump would solve the wasted water problem. With a demand hot water system you don’t run any water down the drain while you are waiting, and you don’t wait as long either.
The circulating system must be a “demand" type system. A traditional full time hot water circulating system with a return line from the last fixture back to the water heater will not work. It would either keep the heater on all the time, or it wouldn’t pump enough water to turn the heater on at all, depending upon the size of the pump. A traditional circulating system will void the warranty of a tankless unit, or greatly reduce it.
By combining a tankless water heater with a demand type hot water circulating system you get the best of both worlds. You save energy and you save water. Perhaps best of all you save time since you don’t have to wait as long for your hot water.
Four Advantages
1. Having never-ending hot water, so you can take long showers.
2. Lower monthly power bills.
3. You'll need less room in your home for the heater: tankless units are very small and hang on a wall.
4. Going green by not heating up a full tank of hot water 24/7.
Four Disadvantages
1. You may have to wait a minute or more after turning on the faucet before the hot water starts coming out. This wastes water; an Australian researcher reported that tankless water heaters waste a substantial amount of water.
2. Sometimes people buy smaller units than their family needs, and in that case, they don't have enough hot water at times. People in colder regions seem to have more of a problem this way, because the incoming water temperature can be very low, particularly in the winter.
3. For one reason or another, you might struggle to get your tankless unit working right. Mostly, the problems relate to the installation having been done incorrectly in some way, as very few people who install them are experienced at doing so. If you are upgrading in an existing house, chances are there will be a lot of upgrading, whether you are doing a gas or an electric installation. The reason is that all these units have to be called power hogs during the time that they are heating water.
4. Higher costs of installation: tankless hot water heaters cost at least twice whatconventional tanks do, and you also pay for the labor of installation and for any upgrades to your gas or electric lines.
When considering the purchase of a tankless water heater, think about these things and do your homework. If you know what to beware of, your chances are greater of being satisfied.
Both William Lund & Lou Wright are contributors for EditorialToday. The above articles have been edited for relevancy and timeliness. All write-ups, reviews, tips and guides published by EditorialToday.com and its partners or affiliates are for informational purposes only. They should not be used for any legal or any other type of advice. We do not endorse any author, contributor, writer or article posted by our team.
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