Low hot water pressure is a common household problem that can disrupt your daily routine and cause you unnecessary stress. Trust me, we live in an area where water supplies can be a bit patchy and our water pressure is sometimes an issue, so I know how frustrating that can be. But if you are looking for a few tips on how to fix low hot water pressure, read on for some advice from the experts who specialise in repairs and next day boiler installation and a few tips and tricks you can try.
This is a collaborative post.
How To Fix Low Hot Water Pressure
Whether it’s a weak flow in your kitchen sink or a trickle from the showerhead, low water pressure is an issue no one wants to deal with. But don’t panic, finding the cause of low hot water pressure and dealing with it can quite quickly restore the steady flow of hot water to your home.
So let’s look closer at low hot water pressure and see if we can find some practical solutions to help you solve this oh-so-frustrating problem you are having.
What Causes Low Hot Water Pressure?
I suggest before jumping to trying to find a solution, it’s actually a very good idea to understand the common causes of low hot water pressure. By identifying what might be causing your low hot water pressure, you can choose the best way to resolve the problem. It might save you a lot of hassle (and money) in the long run.
Mineral Buildup in Pipes and Fixtures
In areas with hard water, like where I live, mineral deposits such as calcium and magnesium can accumulate inside pipes, faucets, and showerheads over time.
These build-ups can narrow the pipe diameter, restricting the flow of water – hence what is causing the lower pressure. Plumbers find that mineral deposits are often the culprit for pressure issues in homes with hard water and without a water softener.
Sediment Buildup in the Hot Water Heater
Commonly, ageing water heaters experience sediment build-up, where tiny particles like sand, rust, or mineral flakes settle at the bottom of the tank.
You’ll find that this can block the outlet pipe, reducing the pressure of hot water entering your home’s plumbing system.
Corroded or Damaged Pipes
Do you live in an older home with steel pipes or ageing copper pipes? If so, you may find that these have corrosion, which reduces pipe capacity.
Did you know that corrosion can also cause small leaks or small holes in the pipes, leading to lower hot water pressure?
Faulty or Malfunctioning Pressure Regulators
If you aren’t that familiar with plumbing and boilers, you may not know that most homes, particularly new builds have a pressure regulator. This controls the water pressure for the entire house.
If this pressure regulator malfunctions, you may experience lower pressure for both hot and cold water. A broken pressure regulator is actually a relatively common issue that requires replacement or repair.
Clogged or Partially Closed Supply Valves
Simple things like partially closed supply valves can cause lower water pressure. This can include the hot water shutoff valve, main shutoff valve, or even valves on individual fixtures. Even a partially open valve can significantly reduce water flow.
Hot Water Heater Problems
You’ll find that the heating elements or internal components of a hot water unit or boiler may wear out over time. This can cause inefficiencies in water heating and will reduce the water flow in your home. In some cases, scaling inside the water heater can also obstruct the flow of water.
Water Line Issues
Did you know that problems with the main water line or main water supply line leading to your home can impact water pressure throughout the entire house? Leaks or blockages in the water main may require a plumber. It may be that there is a main water leak which is being dealt with by your local water company. We often find that we have a restricted flow if there is a local water leak in our village.
Low-Flow Fixtures
Fixtures such as low-flow showerheads or aerators on faucets are designed to conserve water but may not give you much in the way of water pressure. So you’ll need to balance your desire to save water with your desire to have higher pressure in your shower.
Diagnosing Low Hot Water Pressure
To determine the cause of low pressure, follow these steps:
Identify the Affected Area
The best way to start is by checking if the issue is localised to one fixture, like a kitchen sink, one specific hot tap or even a shower in your home. If it’s not and multiple fixtures are experiencing low water pressure, your low hot water pressure is likely affecting your entire home.
If only one area is affected, it is safe to assume the problem is likely related to that fixture. If the problem is that much more widespread, the cause of your water pressure issue is likely deeper in the plumbing system.
Measure the Water Pressure
If you feel confident doing so, and using a pressure gauge, test the water pressure at a fixture. Most homes operate best at 40–60 pounds per square inch (PSI).
If the pressure is below this range, you might have an issue with the main water line, a malfunctioning pressure regulator, or clogged pipes.
Inspect the Hot Water Heater
The next step when looking at how to fix low hot water pressure is to examine your hot water system tank for signs of sediment accumulation or damage.
Flushing the tank may improve performance. Check the drain valve and surrounding areas for leaks or scaling. It’ll be relatively easy to see if there is a leak coming from your tank as it will be wet.
Examine Supply Lines and Valves
The next step on how to fix low hot water pressure would be to ensure that all valves, including the hot water valve and supply valves, are in the open position. If you weren’t aware, partially closed valves can restrict water flow and create pressure issues.
Check for Corrosion or Leaks
The next suggestion would be to inspect pipes for signs of corrosion, leaks, or even anything that might be blocking the flow of water.
How to Fix It
Once you’ve worked out what the cause is of the low water pressure, it’s time to tackle the issue. Here are some suggestions for the best ways to resolve these.
Clean Fixtures and Showerheads
A clogged fixture is often the first thing to check – it’s also one of the easiest to remedy. Remove the showerhead or faucet aerator and soak it in a vinegar solution to dissolve mineral deposits. You can also buy specific descalers which can be used on things like shower heads, you will need to soak them in the solution to dissolve the build-up. For severe clogs, you may need to replace the shower head or faucet. We’ve had to replace quite a few shower heads due to our hard water and the build-up which is tricky to get rid of.
Flush the Hot Water Tank
Over time, sediment buildup at the bottom of the tank reduces efficiency. You could try flushing the water heater tank. This involves attaching a hose to the drain valve and allowing water to run out until it flows clear. You’ll find that regular flushing can help maintain good pressure.
Replace Corroded Pipes
When you look into it and if your home has older steel pipes or corroded copper pipes you could choose to replace them. This will help to prevent any future blockages or low water pressure issues.
Fix or Replace the Pressure Regulator
This is where it starts to get a bit more technical. A faulty pressure regulator should be replaced by a plumber. It’s actually quite a simple fix that can restore consistent water pressure for you, but it’s best to get the experts in for this.
Install a Water Softener
If you find that hard water is causing mineral buildup in your pipes and fixtures you could go about installing a water softener. This will help protect your plumbing and keep your water flowing at the pressure you expect.
Upgrade Your Boiler
If your boiler or heating system is outdated or inefficient, consider upgrading to a tankless heater like a combi boiler. This is one of the more costly options when considering how to fix low hot water pressure but these systems provide on-demand hot water without the risk of sediment accumulation. Boilers have moved on so much in the last few years and there are a lot of options out there so it’s worth looking at this as a home improvement. Do some research as there are often grants available to help out with the cost of these.
Check the Main Water Line
If you think it is an issue with the water supply then you’ll need to contact your water company. If it’s an issue with the water once it reaches your house, you’ll need to speak to a plumber.
Prevention For The Future
It’s a good idea to keep on top of the maintenance of your heating and hot water system if you have had an issue with low hot water pressure. Here are a few tips to keep problems at bay.
Perform Regular Maintenance
It’s a good idea to flush your hot water heater tank every year and also do an inspection for any issues.
Use Water Filters
You could think about installing water filters to trap debris before it enters your hot water system or fixtures. This will help massively by reducing the risk of sediment buildup.
Upgrade Plumbing Materials
If you have old pipes or an outdated water system, you could replace these for a fuss-free future. This is really only worth doing if you are planning on staying in your home shortly.
When to Call a Professional Plumber
While it is worth doing some of these tasks yourself, if you are getting repeat problems or they are a bit more complicated, it may be worth asking a professional for some help. You don’t want to be making more problems for your home if you aren’t really sure what you are doing.
Low hot water pressure is a bit of a nuisance, but hopefully, this post has given you some ideas on where you can start to look into the problems.