Instanta WMSP15 (WM15-3SS) 15 Ltr Wall Mounted Water Boiler

The Instanta WMSP15 is a 15-litre wall-mounted auto-fill water boiler designed for continuous hot water supply in commercial and hospitality environments. It draws directly from a mains water supply, maintains a reservoir of hot water at a set temperature, and dispenses through a single tap — keeping hot water available throughout service without the need for manual refilling.

In practice, this type of boiler suits operations where hot water demand is steady rather than sporadic: a busy café running constant tea and coffee service, a staff canteen with defined meal periods, or a hotel breakfast operation where throughput needs to be reliable from open to close. The 7-day programmable timer allows the unit to be scheduled around your actual trading hours, so it is up to temperature when you need it and not drawing power when you do not. The adjustable temperature control lets you set the output to suit your specific use — whether that is just-off-boil for filter coffee or a lower setting for green teas or soups.

Key operational advantages include:

• Programmable timer reduces energy consumption outside service hours
• ECO mode lowers running costs without affecting hot water availability
• Programmable filter change indicator removes guesswork from maintenance schedules
• Built-in diagnostics support early fault detection and reduce downtime risk
• Wall-mounted installation keeps counter space free for service equipment

Installation requires a mains cold water connection and an appropriate power supply — hardwiring is recommended for a clean, permanent installation, though the unit can also run from a 13-amp socket depending on your setup. A drain connection will also be needed. Wall mounting means the unit needs a suitably solid surface and clear access to the tap for service. As with any plumbed appliance, it is worth confirming water pressure compatibility and discussing filter requirements before installation, particularly in hard water areas where scale management will affect long-term performance.

The WMSP15 is well suited to small-to-medium commercial operations with consistent but moderate hot water demand — cafés, small hotels, staff kitchens, office catering, and similar environments. For sites with higher throughput or multiple service points, a larger-capacity or higher-output unit may be worth considering.

If you would like to talk through whether this boiler is the right fit for your service volume and installation setup, the team is happy to help.