How to Improve Water Pressure in Your Shower
Does your shower feel more like a drizzle than a downpour? Low shower pressure is one of the most common plumbing complaints we hear from NZ homeowners and something our Ka Pai Plumbing team have helped many homeowners fix.
A dribbly shower is a sad way to start your day. The good news is there's almost always a solution — and it doesn't always mean a big spend. The right fix depends on what's causing the problem, so this guide walks you through the most common causes and your options, from a simple shower head swap all the way through to a full system upgrade.
What’s Causing Your Low Water Shower Pressure?
The first thing to understand is what type of hot water system you have — because the cause of your low pressure, and the solution, will be different depending on the answer.
Low pressure hot water system
The most common culprit of low water pressure in the shower is an old low-pressure hot water system. These systems were popular in older homes but can’t provide the strong, steady water flow that modern mains pressure systems deliver.
If you’re not sure what kind of system you have, check your hot water cylinder – there may be a label on it. If it’s not clear, give us a call, and we’ll help you figure it out.
If you’ve got a low water pressure system, we can fix it and the best way is to upgrade to a high pressure system.
Blocked or worn shower head
Check your shower head, mineral deposits and limescale build up inside shower heads over time, restricting flow. Some shower heads also come with a built-in flow restrictor — a small plastic disc designed to limit water use — which can be removed if your system supports higher flow.
Shower mixer issues
If your hot and cold pressure are unequal — common in NZ homes with a low pressure hot water system and mains pressure cold supply — a standard mixer won't balance them well. A low pressure shower mixer or unequal pressure mixer is designed specifically for this situation and can make a significant difference without a full system upgrade.
Partially closed isolating valve
If your pressure has dropped suddenly rather than always been low, check that the isolating valve on your water supply hasn't been partially closed — sometimes this happens after maintenance work and is an easy fix.
How to Increase Water Pressure in Your Shower — Your Options
Option 1: Upgrade to a high pressure shower head
A high pressure shower head is designed to maximise flow from whatever pressure your system delivers — either by concentrating the spray pattern, reducing the number of jets, or using air-injection technology to create a more powerful feel without increasing actual water volume. This is the cheapest and easiest first step.
In NZ, brands like Methven offer specific low pressure shower heads designed for gravity-fed systems. Look for models labelled "low pressure compatible" or with a minimum operating pressure of 10–30 kPa. Avoid water-saving shower heads with built-in restrictors if pressure is already your problem.
Can a shower head improve water pressure? Not technically — a shower head can't increase your system's pressure. But a well-designed low pressure shower head can make your shower feel significantly more powerful by optimising how the water is delivered.
Option 2: Install a low pressure shower mixer
If your home has a low pressure hot water system and mains pressure cold water — which is common in older NZ homes — a standard shower mixer will struggle to balance the two. A low pressure shower mixer is engineered to handle this pressure difference and deliver a consistent, comfortable shower.
Methven is a well-regarded NZ brand for low pressure mixers. Installing a new shower mixer is a job for a licensed plumber — if you're in Wellington or Porirua, Ka Pai Plumbing can supply and install one for you. Get in touch for a quote.
Option 3: Upgrade to a High-Pressure System
If a new shower head and mixer don't fully solve the problem, or if you want a permanent solution that improves water pressure throughout your whole home, upgrading to a mains pressure hot water system is the most effective fix.
These systems are designed to deliver strong, consistent water flow throughout your home, not just in the shower.
Another popular option is a continuous flow hot water system, also known as a gas or instant water heater. These are efficient, take up less space, and provide endless hot water at mains pressure.
How much does it cost to upgrade to mains pressure hot water in NZ?
A new mains pressure cylinder: $2,500–$3,500
A continuous flow system: $2,000–$4,000
The exact cost depends on the size and type of system you choose, as well as any additional plumbing work needed.
This is something we can provide a fixed price for, before we begin the work, get in touch for a quote.
Is Your Plumbing Ready for High Pressure?
If your home has older plumbing, the pipes might not be designed to handle the increased pressure from a modern system. Before installing, we’ll inspect your plumbing to ensure it’s ready for the upgrade.
In some cases, we might need to replace narrow or outdated pipes to prevent leaks or other issues. We can also provide a quote for this to make sure there are no surprises when you get your invoice.
Why Better Water Pressure is Worth It
High-pressure plumbing adds long-term value to your home. Not only will it make your day-to-day life better when you wash clothes, fill pots and rinse your dishes, prospective buyers will be happy it’s already been taken care of.
Ka Pai Plumbing is Here to Help.
Ka Pai Plumbing helps Wellington and Porirua homeowners diagnose and fix low shower pressure every day. Here's what we can do for you:
Identify what water pressure system you have
Recommend and install a low pressure shower head or mixer
Provide a quote to upgrade your water pressure system from low-pressure to mains
Provide a quote/report for prospective buyers detailing the pressure system and upgrade cost
Complete the upgrade for you with a 12-month workmanship warranty
Call us or get in touch, by filling out this form and someone from our team will get back to you.