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Low Hot Water Pressure? Here Is Why

A couple of factors are always in play whenever you have low hot water pressure. Check our blog for reasons and simple fixes for your hot water system.

Your hot water pressure can drop suddenly or inexplicably. Or it can be an ongoing problem that worsens over time.

There are factors always in play whenever you have low hot water pressure. Both cold water and hot water passing through your hot water system must have the same pressure. Widespread low water pressure can indicate serious plumbing problems.  A discrepancy in the two flow rates may be due to hot water system problems or issues with your home’s entire water supply system. This should be taken care of quickly.

But be warned: don't tinker with your hot water system. It can be dangerous. If you need to have it looked at, or if you need to test your Thermostatic Mixing Valve (TMV), a valve that blends hot water with cold water to ensure constant, safe shower and bath outlet temperatures, preventing scalding, contact a licensed and trusted plumbing professional. 

Low Hot Water Pressure

Let’s take a better look at some of the causes of low hot water pressure. Having a better insight will help you solve and restore the flow of water and make sure it doesn’t happen again or when to call the professional to do the job.


1. Accumulation Of Sediment And Scale In Your Hot Water System

Whether you use an electric or tankless gas hot water system, you are not free from sediment and scale buildup. When the interior of the tank corrodes, the corroding particles find their way down to the base of the tank. Here they may be drawn gradually into the hot water pipes, causing blockage and subsequently a drop in water pressure.

For a relatively new hot water heater, flushing and cleaning the sediment and scale from the tank’s interior will work. However, in cases of older systems, a complete hot water system replacement is the better option. Invite your plumber to determine the better option.


2. Plumbing Lines With Several Bends

You will most likely find an accordion-type copper water pipe in your tank-type hot water system. These pipe types are known to bend easily. In cases of serious bends, water flow is impaired and subsequently leaving you with low water pressure.

The pressure of hot water systems could be affected if water passes through a lot of bends before emerging from the faucet. With each bend or passage through each elbow, the pressure reduces slightly.

You can repipe the plumbing lines that lead to problematic faucets. But if the issue affects the entire system, you can install a pressure regulator if you don’t have one yet. Your plumber can set the regulator to increase your hot water pressure.


3. Partially-closed Shutoff Valve

Water flow can be reduced by a partially closed shutoff valve. This can cause a reduction in pressure across the entire system of hot water supply in your home.

The simple fix here is to open the shutoff valve completely. This allows a consistent flow of water at the highest speed and pressure possible with no hindrance whatsoever.


4. General Low Water Pressure

The entire house can experience a sharp drop in lower pressure. In such cases, both the cold and hot water supplies flow reluctantly. The fix is usually from the main water supply entering your home.

You can install a pressure regulator if you don’t have one yet. Ask your plumber to set the regulator to increase your hot water pressure.


5. Wrong Sizes Of Water Lines

When the size of the water supply lines is considerably smaller than that of the main water supply or vice versa, the water pressure will decrease. Water will tend to flow from the large pipe into a smaller pipe.

Repiping is the first option here. This makes the supply lines bigger. This, in turn, reduces friction, while increasing the pressure. Note that the effect, i.e. the increase in pressure – can be considerably pronounced in some cases.


6. Faulty Or Wrong Configuration Of The Pressure Regulator

If you have a pressure regulator and is not set correctly, there won’t be adequate water pressure all through your home.

Start by checking the regulator’s setting. You can tune it properly to the normal pressure. But if the setting is correct and you still have reduced water pressure in the cold and hot water lines, you may consider replacing the regulator. Call your professional plumber.


7. Worn Out Fixture

A worn-out fixture or faucet will contain high amounts of scale, reducing the hot water pressure. The simple fix is to replace the affected faucets and perhaps avoid hard water.

If you have confirmed that the faucet or fixture is the reason for the drop. Ask your plumber to replace them with new ones.


Need a Plumbing Service?


Whether you’re looking for a fix or a total replacement, trust the best plumbers in Sydney at Fixed Today to do the job for you. Contact the hot water system experts and get your hot water systems Fixed Today!

We’ll fix your low hot water pressure, and give you a free home inspection to make sure your plumbing system is good as new.


Fixed Today Plumbing Team

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