Choosing the right system
Replacing an old or failed pump
When a pump finally gives up, the easy move is to buy the same model again, but it’s also your best chance to get the sizing right, especially if the old one never quite kept up. A few numbers make the choice straightforward.
Read the old pump’s label first
The nameplate on your old pump lists its key numbers: flow (litres per minute), pressure or head (metres or bar), and power. That tells you what you had. If it worked well, match those numbers; if it always struggled, weak pressure or short-cycling under load, that’s your cue to size up.
The two numbers that matter
- Flow, how much water you need at once. More outlets running together needs more flow.
- Pressure or head, how strong, and how far up, the water has to go. Every pump has a curve matching flow to pressure; pick one whose curve comfortably covers your needs, with a little headroom.
Match the practicalities
- The inlet and outlet size, so it fits your existing pipework without necking down.
- Your water source: a tank, mains-fed, or a bore that needs a submersible.
- The space and power at the site, and whether you want to keep the same footprint.
A chance to upgrade
If the old pump was a fixed-speed unit that hammered on and off, a modern variable-speed pump holds a steady pressure, runs quieter, and lasts longer. And a smart pump means the next time something goes wrong, you see it coming in an app instead of discovering it when the pressure drops.
Getting the size right, without the guesswork
Our quick quiz turns your home details into the right Boost model in a minute, and once it’s in, the app holds the pressure you set and watches its own health, so the replacement outlasts and outperforms what it replaced. Not sure which size matches your old pump? Tell us the old pump’s flow and pressure and we’ll point you to the right one.
Common questions
Should I just buy the same pump again?
If it genuinely suited your home and lasted well, matching it’s fine. But if it ever struggled to keep up, or you have added bathrooms or outlets since, replacement is the moment to size up. Read the old label and be honest about whether it was enough.
My old pump’s label is unreadable, what do I do?
Work from your home instead: how many outlets run at once, how many storeys, and your water source. Our quiz uses exactly those to recommend a size, no old label required.