What Causes Low Hot Water Pressure In Kitchen Sink Only?

Imagine stepping into your kitchen, eager to wash a pile of dishes or fill a pot for cooking, only to be met with a frustratingly weak stream of hot water.

It’s a scenario many homeowners have faced, and it can be puzzling and exasperating. How to fix low hot water pressure in kitchen sink is a question that has plagued many, but before diving into solutions, it’s essential to understand the root of the problem.

In this article, we’ll examine the potential causes behind this issue. While the bathroom shower and other faucets might be working perfectly fine, why is it that the kitchen sink seems to lag behind?

Key Points:

  • Low hot water pressure in kitchen sinks can be caused by various factors, such as clogged faucets, faulty pressure regulators, inadequate water supply, and pipe issues.
  • Common solutions include cleaning the diverter, checking for cracks or debris in the hoses and pipes, and checking for blockages in the aerator and hose.
  • Lastly, low hot water pressure can be caused by closed shutoff valves and inadequate flow due to elevation differences.

What Causes Low Water Pressure In The Kitchen Sink?

There are a number of potential culprits to consider when it comes to your water, and these can include:

A clogged faucet or sprayer

This is one of the most common culprits if you are experiencing low hot water pressure, but it is easy to identify and work out the best solution.

The issue is usually with the sink, so start by turning on the faucet to run the water. Watch to see if any leaks appear – these tend to be in the joint between the sink and hose or from the hose itself.

The next stage is to turn off both the faucet and the hot water supply valve and take the sprayer apart.

If you’re experiencing no hot water pressure in the kitchen sink, examine the diverter.

This component directs hot water from the faucet to the sprayer and should be intact, in optimal condition, and devoid of any build-up. Should you spot any debris, immerse the diverter in a mixture of vinegar and water overnight.

It’s also advisable to detach the spray head to inspect if the aerator is clogged with sediment or other debris, a frequent issue. Another essential step is to check the hose, ensuring it’s clear of any obstructions.

In case of any build-ups on the spray head or hose, submerge them in vinegar overnight. Afterward, rinse thoroughly with water before putting them back together.

Lastly, it’s beneficial to inspect for any cracks, damages, or accumulated sediment. These signs suggest that a valve or component might need replacement.

Issues with the pressure regulator

Another common cause of low pressure in hot water is a faulty pressure regulator.

This is located beneath the front hose connection of your home and will be pre-set by the manufacturer. If this is broken or damaged, the main priority is to call out a professional plumber who can replace the necessary elements quickly and get your water back to its best.

Issues with pipelines

Issues with pipelines

In some cases, problems with low water pressure in your kitchen faucet can be caused by an inadequate water supply.

If you notice that hot water pressure is low but cold is fine in the kitchen sink, it’s likely not limited to your kitchen. Such issues can be observed throughout the house, affecting both hot and cold faucets.

The more faucets you turn on, the more the pressure drops due to the water distribution reducing pressure throughout the residence.

Addressing this might necessitate professional expertise. Experts typically begin by assessing the incoming flow and pressure before the regulator. This regulator is often the culprit behind reduced pressure, and it’s a straightforward fix for a plumber.

Furthermore, the elevation can influence low hot water pressure. It’s essential for the hot water heater or storage tank to be positioned at an elevated location, ensuring water flows downward efficiently.

Hot water pressure can also be affected if the pipeline is damaged and requires a thorough cleaning; it may be blocked by sediment, leaking from a crack, or blocked by a build-up of mineral deposits, which means water cannot flow through properly.

The latter is particularly common if your pipes are made from galvanized or cast iron, as this causes the metal of the pipes to react with the water, resulting in a build-up of deposits. Homeowners in a hard water area are also more likely to be affected and may need to clean pipes regularly.

Shutoff valve

In some cases, the answer to your question could be simple: the shutoff valve may be closed.

These control the amount of water that can flow through the faucet and can result in a drop in water pressure if they are not turned off all the way. Make sure the handles of the shut-off valve are turned all the way to the right, then recheck your pressure by running the hot and cold water to compare.

Consider recent works

If the issue with pressure is a recent one, consider whether or not you have recently added any extra water outlets into your home; if there is increased demand, the pressure may have dropped. If this is the case, it could be a big job that involves increasing the size of your main water pipe.

Check the pressure

Water Pressure

Experiencing a loss of hot water pressure in the kitchen sink? One potential culprit could be an issue with the pressure-reducing valve.

This bell-shaped component plays a crucial role in regulating the hot water pressure from the municipal supply into your home, and you can typically find it on the waterline.

To potentially rectify the situation, ensure the screw atop the valve is loosened by turning it counterclockwise. After this adjustment, test the hot water again to observe any improvements.

However, it’s worth noting that over time, sediment can wear down or damage the valve. If this is the case, a replacement might be in order to restore optimal water pressure

Keep an eye on the cartridge

As well as the hot water valve, problems can also arise with the cartridge. This cartridge is a feature of most modern faucets, and they contain small holes that can become blocked with sediment and debris. This problem can affect the water pressure and are a common cause of a drop in pressure.

Check the status of the cartridge by turning off the water supply and running the faucet for a while to ensure that all water has flowed out. Replace the plug and place a bucket under the sink to catch anything unexpected. 

Next, remove the screw cap beneath the faucet, lift the handle, and remove the cartridge nut. 

Finally, remove all the pieces in the faucet, take out the cartridge, and wash it under clean running water.

Check for limescale; if this is present, soak the cartridge in vinegar, and then place the cleaned cartridge back into the faucet. Make sure it is totally aligned with the slots in the faucet cavity, and recheck the pressure of the hot and cold water.

This job may be one for the experts!

Stay calm under pressure!

Whether it is the hot water heater, the valve, a leak, or a build-up of unwanted substances, the answer to what is causing your low water pressure could be a complex one.

The best place to start your investigation is to consider whether your cold water is being affected in the same way; this can help to identify the source of the problem.

We have worked to outline the most common causes of a drop and some easy potential solutions to get everything up and running as usual. In some cases, however, the best course of action can be to call in the experts; pressure can be a tricky area, and it is easy to get it wrong.

2 thoughts on “What Causes Low Hot Water Pressure In Kitchen Sink Only?”

  1. Thank you for mentioning that a sediment buildup may be the cause of low hot water pressure in a kitchen faucet. I was dumbfounded with my kitchen the other day when it was the only place where the water didn’t seem to function properly, having a much lower output than the rest of the faucets. Since my kitchen faucets haven’t been updated or replaced in a long time, it is possible that they are experiencing some form of buildup preventing them from working properly, so I’ll look for a plumber in my area that can stop by and help me get these replaced.


Leave a Comment