what does a code 12 on an rinnai tankless water heater mean?

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Answered: What are the advantages of usign a tankless water heater within my home

A tank less water heater must heat the water quickly on demand so you have hot water when needed so it actually uses more energy to accomplish that however a water tank is heated 24/7 even though you are not using hot water it is still heating it so it will be there when you need it therefore it is ...

Answered: Hard water problems

Yes, there are many problems using very hard well water with tankless heaters. According to a study at New Mexico State University, commissioned by the Water Quality Research Council, water heaters operate from 22 percent to 30 percent less efficiently when plagued with hard water scale. Read More ...

Answered: How long do tankless water heaters generally last?

Now this type of water heater is very popular because of its environmental friendliness and energy efficiency. Very well this topic are covered on the site http://thetanklessheaters.com .

Answered: Gas control dial on water heater tank got wet and will not turn

If the control got wet, then you have a leaky tank. It is time to replace the heater.

Answered: Anybody out there familiar with electric tankless water heaters that run

Yes, they are suitable for Residential use, a bit more Expensive, then conventionals, but in the long run probably the best for conserving energy...
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Whole House Tankless Hot Water Heaters

Read http://thetanklessheaters.com and find all answers on your questions

What could be wrong when the water heater keeps ...

It could be that that the gas volume is not set high enough. A plumber can check this for you. My gas volume was between 7-8 and the heater kept cutting off. The plumber set the volume to 12 and it works fine now.

Hot and Gas Water Heater

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Is the water heated consistantly with a solar water heater?

With solar pool heaters , you are going to get excellent heating when there is direct sunlight. On cloudy days or during the night, you will not heat as much. However, because of built in reservoirs that store warmed water, there will be some heated water available on those days.