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Most die-electrics on water heaters will leak. But there are plenty of WH tanks with copper male adaptors just screwed into the tank bungs and never a problem.

A dielectric union from Cater Depot can reduce corrosion caused by galvanic action between two different metals because it provides insulation.

A hot water tempering valve is a very important component to have as part of your hot water heating system. It protects you and the people that use the taps on the property. To make sure the water does not come out far too hot and cause real injury and pain, make sure your hot water system has a valve and if unsure call in a local plumbing expert.

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So what exactly is a tempering valve? This important hot water system part is the best way to ensure people using hot water do not suffer from burns or scalding when they turn on any of the taps. It is essentially a tool that mixes hot water with cold water to produce the right temperature so when you turn on the tap upstairs, downstairs, they both meet the required temperature. Then you might wonder how that differs from a TMV or thermostatic mixing valve. While both do act to blend hot and cold water together to reach a suitable temperature, here are the key differences between the two parts.

Thermal expansion can also lead to a ruptured or distorted hot water heating tank and may void the manufacturer's warranty (see fig .2) . Plumbing codes require ...

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Regular maintenance of your system is also advisable as components can wear down more quickly than the whole system and need repairing or replacing to extend the lifespan of the hot water system and keep it working to your requirements.

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I've seen many copper to black & Galvanized steel, Brass to black & Galvanized steel that look as good as the day they went together.  Mad Dog 🐕

Additional rules include that the hot water temperature control valve must be installed by a plumber that is licensed. If you have a new hot water system installed, or replaced, or moved from one property to another, a tempering valve is required. If you are unsure if you have somehow ended with a system that does not have this valve call in your professional licensed plumber to investigate straight away. You can ask for recommendations from neighbours or family or you can look in your local phone book or online. It is very important you choose the right plumbing services, but there are other qualities that can play an important role in the kind of plumber you end up with like experience, what online reviews are saying, years in business and such.

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There are different types of tempering valves and the type you need depends on the size of your hot water system and the type of hot water system you have. A plumber is the best person to judge what kind of hot water mixing valve is needed if yours needs replacing. Some examples of types include:

It is easy to take for granted the luxury of having hot water whenever you need it in the home or business. But losing it makes you realise how essential it is to you. For your heating, your showers, dishes, washing, drinking and so on. You want to make sure you have the best system in place to avoid having constant problems and to avoid burns and injuries. A good plumber would suggest that this means having the right system for your needs and making sure it is well maintained. For your family’s and your own safety, you should also make sure there is a hot water tempering valve in place.

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I can't answert your question about code -- but there is a world of difference between joining black iron or even plain steel to copper and joining galvanized to almost anything. Galvanized is zinc coated -- and while the zinc protects the steel, after a fashion, it aggravates corrosion when in contact with copper-- with the copper coming off the worst, frequently.

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Wondering if your hot water system really needs one? Then the answer is absolute yes, it needs a hot water system tempering valve. It is a requirement according to Australia Standards (AS3500) which state that the hot water in your system is set to a safe temperature. Rules include that stored water be at least 60 degrees Celsius to prevent the growth of dangerous bacteria but that when it comes on of a tap in the home it should not be any hotter than 50 degrees Celsius.