Mains water pressure gauge
Updated: 22 October 2026
The shower is weak, or you are about to fit a pump, and you want a number from the outside tap. A mains water pressure gauge here means one of three 0–11 bar hose testers, not a compressor dial and not Ofwat’s own test. This page follows Uharbour, Stowberry, and Thermometer World on amazon.co.uk, plus Ofwat, Severn Trent, and Affinity Water. All twelve gauges are in the [pressure gauge comparison](/hub/measuring-equipment/pressure-gauge). Peter F. set this out on 21 October 2026. There is no lab, and no national average pressure. A qualifying purchase can earn a commission at no extra cost to you.
The shower is weak, or you are about to fit a pump, and you want a number from the outside tap. A mains water pressure gauge here means one of three 0–11 bar hose testers, not a compressor dial and not Ofwat’s own test.
The shower is weak, or you are about to fit a pump, and you want a number from the outside tap. A mains water pressure gauge here means one of three 0–11 bar hose testers, not a compressor dial and not Ofwat’s own test. This page follows Uharbour, Stowberry, and Thermometer World on amazon.co.uk, plus Ofwat, Severn Trent, and Affinity Water. All twelve gauges are in the pressure gauge comparison. Peter F. set this out on 21 October 2026. There is no lab, and no national average pressure. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Nut | Hose | Scale | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Thermometer World Thermometer World mains tester | BSP; material attribute plastic | Length not printed | 0–11 bar / 160 psi | 6.7 | about £11.95 | View offer |
| Alternative |  Uharbour Uharbour mains tester | Brass 3/4 and 1/2 in BSPT | Braided; tape not included | 0–11 bar / 160 psi | 6.8 | about £11.20 | View offer |
| Alternative |  Stowberry Stowberry mains tester | Reviews: soft plastic; attr. GHT | 300 mm stated | 0–11 bar / 160 psi | 6.2 | about £11.95 | View offer |
On this page
A 0–11 bar tester is for a tap, not for a compressor port
All three read 0–11 bar and 0–160 psi. Uharbour is £11.20, with a 2 inch dial, a braided hose, and chrome-plated brass 3/4 inch and 1/2 inch BSPT nuts. Tape is not included. Stowberry is £11.95, with a stated 300 mm hose. Thermometer World is £11.95, with BSP tap connectors, a plastic material line, and no hose length. None states an accuracy class. A 40 mm compressor gauge is the wrong tool on a hose tap. The number is only as good as the joint. Span and thread in general are on the pressure gauge buying guide.
0.7 bar is a communication-pipe floor, not your needle
Ofwat’s guaranteed standards scheme sets a minimum of seven metres static head, 0.7 bar, in the communication pipe. The June 2026 GSS summary ties a payment to pressure below that floor on two occasions, each lasting more than one hour, within 28 days, with exceptions. That test is the company’s method at the communication pipe. A screw-on gauge on a garden tap is your plumbing, downstream of the internal stop tap. Severn Trent states 0.7 bar at the connection and aims for 1.0 bar. Another line on the same site says the regulations require 1 bar. Those two lines are not one standard. Ofwat’s public page is the 0.7 bar floor. An aim of 1 bar is not a rule that every kitchen tap must show 1 bar. A low reading on your tap is a reason to check the stop tap. It is not a completed GSS claim.
Shut everything else, then believe the joint
Take the reading with the other taps shut, so the needle has settled. Open one outlet afterwards if you want a running figure. The jug and bucket tests are flow checks. Your company may ask for their method rather than your gauge. The needle counts after the joint is dry. A spray at Stowberry’s blue ring, a weep from Uharbour until you use a wrench, or a gush at Thermometer World’s coupling is a leak at the nut. If the gauge seals and the figure is still poor, phone the company. How the nut seats is on how to fit a pressure gauge.
Plastic nut, GHT, or brass BSPT
Uharbour is the one that states brass BSPT nuts. UK reviews still say it leaks unless the nut is wrenched. The brass claim is a reason to choose it. It is not a hand-tight seal, and tape is not in the box. Stowberry’s bullets say a hose-tap connector. The attribute says GHT, which is not the same claim as BSP. UK reviews describe a soft plastic nut, a washer that sits flush, and leaks at the blue ring. The 300 mm hose is the stated extra, if the nut seals. Thermometer World states BSP tap connectors and a plastic material line, and several UK reviews report a dry fit. Choose brass BSPT when you will tighten a metal nut, Thermometer World when you accept plastic and an unstated hose length, and Stowberry when you want the 300 mm hose and will inspect the washer.
Common questions
What is a normal reading at a UK outside tap?
There is no single national figure in Ofwat’s material, and a retailer’s range is not a census. Your tap sits downstream of the stop tap and the house pipework, so it can read lower than the communication pipe on the same day. Use your company’s published check, and treat the gauge as a spot reading once the nut is dry.
Is under 0.7 bar on my gauge an Ofwat failure?
Not by itself. Ofwat’s floor is 0.7 bar, seven metres static head, in the communication pipe, and the June 2026 GSS summary sets conditions for a payment, including two occasions. A garden-tap needle is not that test. Check the internal stop tap and visible leaks, then ask the company to use their method. Severn Trent’s aim of 1.0 bar is an aim at the connection, not a replacement for the 0.7 bar floor.
Why does the connector leak?
Stowberry’s UK reviews describe a soft plastic nut and a flush washer, with water at the blue ring. Uharbour’s reviews describe leaks until the brass nut is tightened with a wrench. Thermometer World’s file includes a gush at the coupling and also dry fits. The spray is a seal fault. Reseat the washer, or return the tool, before you treat the needle as mains pressure.
GHT, BSP, or BSPT for a British outside tap?
A British hose tap is not a GHT fitting. Stowberry prints GHT on the attribute and a hose-tap connector in the bullets, so those lines disagree. Uharbour states BSPT in brass. Thermometer World states BSP. A tap nut in practice seals on its washer. Match the claim to the metal you can see.
Should every other tap be shut?
Yes, for the settled reading. Other outlets open will drop the needle and give you a running figure. Severn Trent’s jug check and Affinity’s bucket check are also done with other outlets off, and they measure flow, not the same thing as this gauge. Note whether you are reading static or running.
Static pressure or pressure while water is running?
Read static first, with outlets shut and the joint dry. Then, if you want, open one tap and read again. The running figure is lower and it depends on which outlet you opened. Ofwat’s 0.7 bar floor is a static head in the communication pipe, so neither tap figure completes that test on its own.
Which of the three testers states a brass nut?
Uharbour, at £11.20, states chrome-plated brass 3/4 inch and 1/2 inch BSPT nuts. Stowberry’s reviews describe a plastic nut, and Thermometer World’s material attribute says plastic. Brass does not remove the leak notes: UK buyers still say Uharbour needs a wrench, and tape is not in the box.
Related pages
Sources
Public UK sources from the research digest. Shelf prices and star lines are the amazon.co.uk figures captured with these twelve listings. The price bands are this set, not a market average.
- PSSR 2000, regulation 8 (retrieved 22 October 2026)
- HSE: using pressure systems (retrieved 22 October 2026)
- Ofwat: water pressure (retrieved 22 October 2026)
- Ofwat: guaranteed standards scheme summary, June 2026 (retrieved 22 October 2026)
- BSI: BS EN 837-1:1998 Bourdon tube pressure gauges (retrieved 22 October 2026)
- Highway Code annex 6: vehicle maintenance (retrieved 22 October 2026)
- Stewarts Group: guidance on use (retrieved 22 October 2026)
- GNW: BS EN 837 pressure gauge accuracy classes (retrieved 22 October 2026)