Title: 315.022 OSO-NANO-N-MANUAL-NO-SE-FI-EN-146007-05.pdf
3.5.6 Installation recommendationRECOMMENDATION!The safety valve supplied must be mounted on the cold water supply to the heater. See section 3.5.2.If the non-return valve is tight, a reduction valve and expansion vessel should be fitted (to stop dripping from the safety valve).If the maximum water pressure exceeds 6 bar in a 24-hour period, a reduction valve and expansion vessel should be fitted.For installation in a rooms which does not conform to the wetroom standard, a watertight drip tray with overflow pipe > 18 mm. inside diameter should be fitted under the product, in addition to an automatic stop cock with sensor. This will prevent possible material damage.9103.6 Electrical installation