Applications

Residential

Residential

Domestic dwellings, flats, landlord stock and mixed-use residential blocks. Typical risks are hose-union taps, filling loops and garden irrigation.

Residential water safety starts with everyday protection

Homes connect to a wide range of fittings and appliances that can create backflow risk. Correctly specified and maintained protection helps prevent contamination of the mains supply, protects property and supports compliance with BS EN 1717 and water regulations.

Risk reference

Common residential installation risks

Connection type	BS EN 1717 category	Protection method	Notes
Hose union tap	3–5	RPZ or air gap	Depends on downstream use
Filling loop	4	RPZ (BA)	Not a double check on non-house systems

Products

Product families commonly specified against this guide.

Regulation guide

Insights on

Residential

Insight

Royal Free Hospital — 240 RPZ retrofits in 8 weeks

How a live-site maintenance window was used to bring HU outlets into AIM.

Insight

Common RPZ installation failures we still see on site

Missing test cocks, inverted relief valves, and isolation that makes annual AIM testing impossible.

Insight

Specifying air gaps on Category 5 washdown

When a mechanical device cannot replace a Type A air gap — and how to dimension the weir.

Tools & calculators

Calculate, look up, decide

Water usage calculator

Estimate peak and average daily water demand for a building type or specific outlet cluster.

Valve selector tool

Answer five questions about installation type, fluid category and pressure to receive a recommended valve.

Need a specialist for this installation?

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Related articles

Insight

Common RPZ installation failures we still see on site

Missing test cocks, inverted relief valves, and isolation that makes annual AIM testing impossible.

Insight

Filling loops on non-house systems: RPZ or break tank?

Closed heating and chilled circuits are Category 4. A double check on the filling point is not enough.

Insight

Specifying air gaps on Category 5 washdown

When a mechanical device cannot replace a Type A air gap — and how to dimension the weir.