Pressure Manager Buying Guide: Grundfos PM1 vs PM2 for Australian Homes

If your shower runs hot and cold every time someone opens a tap, a pressure manager is usually the fix. A pressure manager is a compact pump pressure controller that starts your pump the moment you open a tap and stops it when flow ends. It holds steady water pressure across the whole house, protects the pump from dry running, and removes the need for a large pressure tank in many setups. At Pumptastic, we supply pressure manager units, pump controllers and complete pressure systems to homes and farms across Western Australia and Australia wide, with free shipping on orders over $100. This guide explains how a pressure manager works, how the Grundfos PM1 and PM2 compare, and how to pick the right unit for a bore, rainwater tank or mains boosting setup.

What Is a Pressure Manager and How Does It Work?

A pressure manager sits between your pump and your pipework. Inside the unit is a pressure sensor, a flow sensor and a small control board. When you open a tap, pressure in the line drops. The pressure manager detects that drop at its cut-in point, usually around 1.5 bar or 2.2 bar depending on the model, and switches the pump on. While water keeps flowing, the pressure manager keeps the pump running, so you never get the annoying start-stop cycling that a basic pressure switch causes. When you close the tap, flow stops, and the unit shuts the pump down after a short delay.

The second job of a pressure manager is protection. If your rainwater tank runs empty or your bore draws down, a pump without protection will run dry and burn out its mechanical seal within minutes. A pressure manager senses that there is no flow and no pressure rise, then cuts power to the pump and shows a fault light. Better units, like the Grundfos PM2, will also attempt automatic restarts at intervals to check whether water has returned. This one feature alone can save you the full cost of a replacement pump, which is why we recommend a pressure manager or equivalent pump controller on almost every domestic pressure pump we sell. You can browse our full range of pump controllers and pressure control components to see current stock and pricing.

It helps to know what a pressure manager is not. It is not a booster pump on its own, and it does not create pressure by itself. It manages the pump you attach it to. It is also different from a pressure tank system, where a bladder tank stores pressurised water and a mechanical switch cycles the pump. Tank systems still have their place, especially on larger rural properties, and we stock Grundfos pressure tanks from 18 litres up for exactly that reason. Many installers in WA now combine a small tank with a pressure manager to reduce pump starts even further and extend motor life. If you are unsure which combination suits your property, call our Perth-based team on (08) 6384 5884 for free advice before you buy.

Grundfos PM1 vs PM2 Pressure Manager: Which One Do You Need?

Grundfos makes the two best known pressure manager models sold in Australia, the PM1 and the PM2, and the choice between them comes down to adjustability and system size. The PM1 is the entry model. It comes with a factory-set cut-in pressure, commonly 1.5 bar or 2.2 bar, and suits single-storey homes, garden irrigation from a rainwater tank, and straightforward pressure boosting jobs. It handles pumps up to 10 amps, gives you dry-run protection, anti-cycling and automatic operation, and it is the simplest way to automate a fixed speed pump. For most standard homes on a tank or bore, a PM1 pressure manager does the job without fuss.

The PM2 is the pressure manager for more demanding systems. Its cut-in pressure is adjustable between roughly 1.5 and 5 bar, so it suits two-storey homes, long pipe runs, multiple bathrooms and small commercial sites where a fixed cut-in point is not enough. The PM2 adds a digital display, adjustable restart behaviour after a dry-run fault, and finer control over how the system responds to small leaks and dripping taps. If your home has an upstairs bathroom, or you are pushing water uphill to a header tank or across a large block, spend the extra on the PM2. Both models bolt straight onto popular pumps, and you will find them fitted as standard on several units in our Grundfos pressure pumps range, including CMB and JP series booster sets that arrive as a complete plug-and-play pressure system.

A quick word on alternatives, because a good pump shop should be straight with you. Davey pumps typically ship with the Torrium2 controller instead of a Grundfos pressure manager, and it performs the same core role with excellent results. We stock the full Davey pressure systems range alongside Grundfos, so you are comparing real options in one place rather than being pushed toward a single brand. Whichever way you go, matching the controller to the pump's amp draw and your household demand matters more than the badge on the box. Send us your pump model and house details through our contact page and we will confirm the right pressure manager before you order.

Choosing a Pressure Manager in Western Australia: Bores, Tanks and Mains Boosting

Conditions in WA shape which pressure manager you should buy. Perth and the surrounding regions run heavily on garden bores, and bore water carries iron and fine sand that can wear cheap controllers quickly. For bore setups from Joondalup down to Mandurah and out to the Wheatbelt, we suggest a quality pressure manager paired with dry-run protection you can trust, because summer drawdown on shallow bores is common and a burnt-out bore pump in January is an expensive lesson. Pair the controller with a decent inlet filter and your system will run for years. For submersible bore installations, browse our submersible bore pumps to match the pressure manager to the pump from the start.

Rainwater tanks are the other big WA use case, especially in the South West and regional towns where households supplement scheme water. Here the pressure manager earns its keep on dry-run protection, since tanks empty faster than most people expect at the end of a dry summer. A PM1 on a small transfer or jet pump is a proven, low-cost setup for garden and toilet supply. For homes further out, in the Pilbara, Kimberley, Goldfields or Great Southern, remember that we dispatch fast from Perth via Australia Post with free shipping over $100, so regional WA buyers are not stuck paying metro trade counter prices or waiting weeks for eastern states freight. Mains pressure boosting is the third case. Older suburbs and elevated blocks around the Perth Hills often see weak mains flow, and a compact booster pump fitted with a pressure manager lifts the whole house to steady, comfortable pressure. Our booster pump and pressure system range covers single homes through to multi-storey buildings.

Where to Buy a Pressure Manager Online in Australia

You can buy a pressure manager from Pumptastic today with fast dispatch Australia wide and free shipping on orders over $100. We are a WA-based online pump specialist stocking more than 3000 pumps and parts, including Grundfos pressure manager units, Davey Torrium controllers, pressure switches, pressure transducers and pressure tanks, plus the complete pressure systems they attach to. Every order is backed by full manufacturer warranty and real phone support from people who size pumps every day, not a call centre reading a script. If you already know the model you need, order online now. If you are not sure whether a PM1, PM2 or Torrium suits your setup, call (08) 6384 5884 before you spend a cent and we will spec the right pressure manager for your pump, your pipework and your water source. The right controller ordered today is cheaper than the wrong pump replaced next summer.

Frequently Asked Questions

What does a pressure manager actually do?

A pressure manager starts your pump when you open a tap, keeps it running while water flows, and stops it when you close the tap. It also protects the pump against dry running and rapid cycling, which are the two most common causes of early pump failure.

Is a pressure manager the same as a pressure switch?

No. A pressure switch only reacts to pressure and causes the pump to cycle on and off while a tap is open. A pressure manager reads both pressure and flow, so the pump runs continuously during use and your water pressure stays steady.

What is the difference between the Grundfos PM1 and PM2?

The PM1 has a fixed cut-in pressure and suits single-storey homes and garden supply. The PM2 has an adjustable cut-in from about 1.5 to 5 bar plus a digital display, which suits two-storey homes, long pipe runs and higher demand systems.

Do I still need a pressure tank if I have a pressure manager?

Often no, which is one of the main space and cost savings. On rural properties or systems with frequent small draws, adding a small pressure tank alongside the pressure manager reduces pump starts and extends motor life.

Can I use a pressure manager on my bore pump in WA?

Yes, and we strongly recommend it. WA bores can draw down in summer, and the dry-run protection in a pressure manager shuts the pump off before the motor or seal is damaged.

Will a pressure manager fix low water pressure on its own?

No. It controls a pump, it does not create pressure by itself. For weak mains pressure you need a booster pump fitted with a pressure manager, which we sell as complete ready-to-install pressure systems.

What size pump can a pressure manager run?

Most domestic units, including the Grundfos PM range, handle single-phase pumps up to around 10 amps, which covers the vast majority of home pressure, tank and bore pumps. Check your pump's amp rating on its nameplate, or send it to us and we will confirm compatibility.

Why does my pressure manager keep cutting out?

The usual causes are an empty tank or drawn-down bore triggering dry-run protection, a blocked inlet filter, an air leak on the suction line, or a cut-in pressure set higher than the pump can reach. If a reset does not fix it, call us and we will help you diagnose it over the phone.

How much does a pressure manager cost in Australia?

Entry-level units start around the low hundreds, with adjustable models like the PM2 costing more. A complete booster pump with a factory-fitted pressure manager typically lands between $600 and $1,200 depending on flow and head. Current pricing is on our pump controllers collection.

Do you deliver pressure managers to regional WA?

Yes. We dispatch quickly from Perth via Australia Post to every corner of WA, from the South West to the Pilbara and Kimberley, and Australia wide. Shipping is free on orders over $100.

Need help choosing? Call Pumptastic's pump experts on (08) 6384 5884, Monday to Friday 9am to 5pm, or shop the full pump controllers range online now.