If you have a standard electric or gas tank, there are a number of things we can do to increase the amount of deliverable hot water from the simple to the complex. One of the ways to do that would be to simply increase the set-point of the thermostat so that the water stored in the tank would be hotter and would therefore go farther. For example, let’s say you crank the temperature in your tank up from 120° to 140°. It would certainly give you more deliverable hot water, but let’s take a closer look at what happens when you do that.

WaterMixing Valve

Check valves are used in many different applications. For example, they are often placed on the outlet side of a pump to protect the pump from backflow. Centrifugal pumps, the most common type of water pumps, are not self-priming, and therefore check valves are essential for keeping water in the pipes. Also, check valves are very often used in HVAC systems (Heating, Ventilating and Air Conditioning systems). HVAC systems are e.g. used in large buildings, where a coolant is pumped many stories up. These check valves are installed to make sure that the coolant does not flush back down.

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1. The higher the temperature of the water in the tank, the faster the rate of corrosion of the tank itself. This equates to:

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One downside is that they typically fail gradually and, in doing so, tend to allow more hot water through them. Because this is gradual, the end user might not recognize the change and could be subjecting themselves to hotter-than-safe water temperatures. So, make sure to watch for that and test the water temperature periodically.

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3. The higher temperature of the water in the tank, the higher the probability of someone getting burned. The time it takes to acquire a serious burn is:

Thermostaticmixing valve

When choosing a check valve, it is important to make a cost-benefit analysis of the specific system. Focus is often to reduce cost and at the same time obtain the lowest possible pressure loss, but when it comes to check valves, a higher safety equals a higher pressure loss. So in order to make sure the check valve protects the system properly, each system has to be assessed individually, and factors such as the risk of water hammer, acceptable pressure loss, and the financial consequence of installing a check valve with a too high safety margin against water hammer have to be considered. Please go to How to choose the right check valve for more details.

The water heater thermostat is turned up to 140°, thus providing a tank full of 140° water. Then as water is drawn out, the mixing valve mixes cold water with that very hot water to deliver whatever temperature the homeowner chooses as their set point, which is usually 120°. This process gives the homeowner more deliverable hot water because it takes less of the stored water to produce it. They do require maintenance (cleaning) to keep them working properly. The normal lifespan for these devices is 5-6 years.

MasterMixing Valve

Mike Henry is one of Rheem’s technical trainers for plumbers. He’s a third-generation plumber who managed his own business for many years and enjoyed working in the field. He maintains Master Plumber licenses in Georgia and Florida.

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As for this last point, we can help safeguard against potentially hazardous conditions simply by installing a mixing valve. A mixing valve is a mechanical device that mixes cold water with hot water to deliver mixed, or tempered, water downstream (think of your shower valve). These devices can be put directly onto the water heater outlet so that the tempered water gets delivered everywhere. As another option, individual mixing valves can be installed at certain points of use to ensure that the tempered water is delivered to that specific location. Taking a look specifically at the mixing valves that install at the water heater outlet, they are relatively easy to install, adjustable and fairly inexpensive.

3/4mixing valve

If a pump stops or a valve closes too quickly, the flow will continue, which will create vacuum downstream to a pump or valve and a very high pressure at the other end of the pipeline. When two different pressures are present in a pipeline, the flow will go in direction of the lowest pressure, which will create a pressure surge. The flow will continue to travel back and forth until the energy has dissipated, and the pressures are equalized. When a pressure surge occurs, although it may only last for a very short time, it can amplify the normal system pressures by up to 10 times or more. This can cause considerable damage to the system including pipe cracks, bursts, cavitation, and implosion due to vacuum pressures being formed. Apart from the resulting costs and downtime these failures cause, the health and safety risks are also considerable. These failures may not be due to one single, large pressure surge but due to repeated surges which eventually cause fatigue failure of the system.

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There are various types of check valves available for water, wastewater and fire protection applications. They work in different ways but serve the same purpose. We offer a wide range of swing check valves, ball check valves, tilting disc check valves and slanted seat check valves. See our full range of check valves

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Water hammer is the result of rapid change in the velocity of a fluid in a pipeline system and is typically caused when moving fluid suddenly stops, such as by hitting an obstacle. For example, a valve which is closed too quickly, will send a shock wave along the pipe with the potential to damage both the pipe and equipment. It will continue to travel along the pipeline until the energy has dissipated, and it can cause a localized increase in pressure and produce loud noises, sometimes resembling a hammering noise, which is the noise of the expansion of the pipe under these conditions.

Check valves are generally installed in pipelines to prevent backflow. A check valve is basically a one-way valve, in which the flow can run freely one way, but if the flow turns, the valve will close to protect the piping, other valves, pumps etc. If the flow turns and no check valve is installed, water hammer can occur. Water hammer often occurs with an extreme force and will easily damage a pipeline or components.

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There are various types of check valves available for water and wastewater applications. They work in different ways but serve the same purpose. AVK offers a wide range of swing check valves, ball check valves, tilted disc check valves, slanted seat check valves, nozzle check valves and silent check valves. Go to the complete range in our product finder. The most common types of check valves for water and wastewater are swing check valves and ball check valves:

All in all, increasing the set-point temperature and adding a mixing valve is not a bad option for someone that’s looking to get more hot water from their tank-type water heater (without going to a larger tank or using more expensive technology).