Low water pressure from garden hose or outdoor tap
Not sure if this matches your problem?
Use our interactive tool — answer a few questions and get a personalised diagnosis.
Most likely cause & what to check
Weak flow from an outdoor tap is frustrating but usually easy to fix. Start by checking indoor taps — if the whole house has low pressure, the fault is at the mains or the pressure reducing valve (PRV), not the outdoor tap specifically.
Check the hose itself. Kinked hose is the most common cause of poor garden tap flow. A 25-metre coiled hose has significant resistance — straighten it fully and check the connector at the tap is fully tightened.
Inspect the tap filter/washer. Some outdoor taps have a small mesh strainer inside the tap body or at the hose connector. Unscrew the connector and check for debris, grit, or calcium deposits blocking the screen.
Check the isolating valve inside — it should be fully open (handle in line with the pipe). A partially closed isolating valve will significantly reduce flow.
If the double check valve was fitted incorrectly or has partially seized, it will restrict flow. Locate it (usually just after the tee in the rising main), unscrew it, and check the internal spring mechanism is moving freely. Replace if corroded (£5–£15).
If mains pressure at the tap is genuinely low (below 1 bar at the tap), the house may have a PRV set too low, or the local mains supply has low pressure. Contact your water company if neighbours report the same issue. For the garden specifically, a booster pump (£80–£200) can increase pressure at the point of use.
Prefer to have it done for you?
Find me an engineer →🛠 Tools & materials you may need
🔗 Some links above are affiliate links — if you buy through them we earn a small commission at no extra cost to you. This keeps the site free.
Was this guide helpful?
Frequently asked questions
Does hose length affect water pressure?
Yes — friction loss in a hose increases with length. A 25-metre coiled hose has significantly more resistance than a 10-metre hose, especially if it is a narrow bore (½ inch diameter). Storing hose in large coils rather than tight circles also helps reduce kinking and flow restriction.
Will a pressure washer work with low outdoor tap pressure?
Most domestic pressure washers require a minimum flow rate of around 5–8 litres per minute. If your outdoor tap pressure is very low, the pressure washer may not achieve its rated output or may cavitate (draw air). Connect the pressure washer directly to the outdoor tap without a hose if possible to minimise flow restriction.
Can I fit a booster pump to my outdoor tap?
Yes — a small garden booster pump can significantly increase pressure at a hosepipe or sprinkler system. These cost £80–£200 and require a power supply near the tap. They are particularly useful in rural areas or older properties with genuinely low mains pressure at the property boundary.