Difference Between Low And Mains Pressure Cylinder

Have you got a low pressure cylinder?

Many older New Zealand homes are equipped with a ‘low-pressure’ hot water system, which is an electric hot water cylinder.

What's a Low-Pressure Cylinder?

Low-pressure cylinders are also known as ‘equal-pressure’ cylinders and are categorised by the water pressure being lower than the mains cold water pressure.

Water pressure is measured and expressed in a measurement called kilopascals (kPa) and metres head (m head), and therefore low/equal pressure cylinders provide water pressure between 10-15k PA.

You're thinking about a Mains Pressure Cylinder

New homes in New Zealand are mostly built with an equipped mains pressure hot water cylinder, providing high-pressure water as well as fast water heating. Mains pressure can deliver up to 500kPA, which is starkly different from the force delivered by a low or equal pressure cylinder.

Lots of people make the switch from low/equal pressure to mains pressure cylinders for several reasons, although there are advantages to having a low-pressure hot water system as well! In modern households where several people share a home, low-pressure systems can be inconvenient due to how long it can take for water to heat up (and it takes longer the further away the tap or shower is from the cylinder.)

The lower water pressure delivered can also be a pain for anyone who enjoys a powerful shower. People who like a full, hot shower – quickly, want a mains pressure system. The advantages of a low-pressure cylinder are the longevity of them as well as the simplicity, so for a home that only has to cater for one or two people, or as a holiday home, they are perfectly acceptable choices.

The Hot Water Shop’s HOT FIVE

5 reasons Why Mains Pressure is better

1. A powerful shower (or a quick bath)

From a strictly performance-based review, mains pressure systems tick more boxes than low-pressure systems. If you live in a household with more than two people sharing the hot water or needing showers at the same time, low-pressure systems are going to probably be more a hindrance than a help.

2. No surprises

Again, if you are in a couple or a smaller flatting situation where you need to shower and get ready at the same time for work, depending on your low-pressure system, you may be waiting longer for hot water to make it to your shower or having to take turns.

3. Hot water faster

Mains pressure cylinders also deliver a larger volume of hot water, with most modern sizes holding 180 litres or more – so is suitable for families, taking baths and high-level hot water use. There is also the quick delivery of hot water to be considered. If you need regular, fast, hot water to accommodate your lifestyle, then a mains pressure cylinder delivers hot water a lot faster than a low-pressure one. As previously stated, the further away the shower is from the low-pressure cylinder, the longer the hot water will take to reach it.

4. Run more than one

With a mains pressure cylinder, you can easily use multiple showers and taps at the same time without a big difference in the flow of hot water, which is ideal in families or for multiple people getting ready to leave the house in a hurry.

5. Works with modern mixers

Modern taps, mixers and shower heads also may not work correctly with low-pressure systems, which can leave you disappointed in your purchase as you get a showering experience that doesn’t match what you bought the new head or mixer for. Low-pressure systems struggle to keep up with the demands of a modern mixer, so make sure you know what kind of water system you have before investing in new fixtures.

How Do I Find Out What Kind Of Hot Water Cylinder I Have In My Home?

The most direct way for you to find out if you have a low-pressure or mains pressure hot water system in your house is actually to look at the cylinder itself. Typically, somewhere on the label, it will be stated what kind of system it is, but if you can’t find any indication – no worries – there are other ways to find out!

If you know how old your cylinder is, it is most likely to be a low-pressure cylinder if it is more than 20 years old!
If the pressure coming out of your shower or hot taps are particularly weak, then the cylinder is probably a low-pressure hot water cylinder.
If you experience in a high-pressure shower, then you have a mains pressure hot water cylinder.

Let’s recap the pros and cons super quick!

– Mains pressure delivers a lot of hot water fast and reliably to multiple fixtures at the same time. In contrast, low-pressure systems are slower to provide hot water and can struggle with that demand and dip in pressure and temperature across the house.

– Mains pressure is suitable for all new mixers, showerheads or fixtures whereas low-pressure systems may not be able to cope with the demand so the new fixture may not function as designed.

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Control at your finger tips!

A controller is not essential for Gas, but is worth considering if you want the benefits of complete temperature control and added features, like having it run you a bath and telling you when it is ready! You use your gas hot water unit more efficiently as less gas is required to heat water to 40 °C (typical shower temperature) than at 55 °C (default temperature without controllers). Plus, there is added peace of mind if you have young children in the house, you can pre-set the temperature to a child-safe level for the period while you are filling the bath.