Keep the two quantities in separate columns
Pressure describes the force available in the water supply; flow describes the volume delivered over time. A pressure reading in bar cannot be entered as litres per minute in a water-use calculation. A large showerhead does not supply either value.
Record the manufacturer’s stated operating requirements for the complete proposed equipment. Crosswater uses pressure categories in its product information, but those labels do not replace a site assessment or the exact model’s requirements.
Ask when and where a measurement was taken
A static pressure reading is taken without the relevant water flowing. A reading during operation describes a different condition. Ask the installer to record the measurement location and which outlets were running so the figure retains its meaning.
The same discipline applies to a flow figure. Note the outlet, settings and other use at the time. Do not ask a household member to dismantle equipment or improvise a plumbing test; arrange appropriate measurement when the survey is carried out.
| Evidence | Record alongside it |
|---|---|
| Pressure figure | Units, location and static or operating condition |
| Flow figure | Units, outlet and operating condition |
| Hot-water arrangement | Confirmed system details |
| Concurrent use | Other outlets that may run at the same time |
| Product requirement | Exact code and current document |
| Unresolved gap | Who will confirm it and before which decision |
Compare complete proposals
Consider the valve, head, handset and intended operating combinations together. A component described as suitable for low pressure does not automatically validate every assembly built around it. Ask the installer to explain how the evidence supports the proposed system.
If you want simultaneous outlets, use the diverter matrix. Avoid assuming that adding a pump, changing a restriction or choosing a different head is universally appropriate; any alteration needs system-specific advice.
Make uncertainty visible on the shortlist
For each option, use three statuses: evidence received, professional confirmation pending, or unsuitable for the assessed proposal. Write the reason. This lets the showroom discussion progress without quietly converting an unknown into an assurance.
Bring the evidence sheet to the showroom. Once a realistic flow scenario is available, the water-use calculator can compare routines. It cannot predict pressure or approve the installation.
The pictured supplier example is Elliot Br Brass Sq Rigid Riser Shower Inc. Easykit. Use its exact specification when comparing options; the image does not confirm stock, showroom display availability or suitability for your room.
Sources & further reading
Prepared with AI assistance from the linked sources and Elegant Haven’s published service information. This guide helps you prepare decisions; product suitability and installation details need confirmation for your own room. It is not a record of a completed Elegant Haven installation or an expert sign-off.