RoyalFlow CSA Smart Tap
A commercial-grade undersink smart tap delivering instant chilled, sparkling and ambient filtered water with outstanding reliability: engineered for offices, commercial kitchens, hospitality and healthcare, in S1 or C1 tap shapes.
About the RoyalFlow CSA Smart Tap
The RoyalFlow CSA is a commercial-grade smart tap. It gives instant chilled, sparkling and ambient filtered water from a single touch-button tap, and the tank unit sits under the sink. The datasheet rates the 2.5 litre chilled tank for up to 100 cups an hour. It is made for high-usage commercial sites: offices, commercial kitchens, hospitality and healthcare.
There is no boiling tank. For boiling as well, see the RoyalFlow BCS. Without sparkling, see the RoyalFlow CA. RoyalFlow is Sovereign Water's own smart tap range, so we specify, supply, fit and service it ourselves. Read sparkling water in the office: tap versus bottled for the case against bottles.
At a glance
- What it is
- A commercial undersink smart tap for chilled, sparkling and ambient water
- Chilled
- 2.5 L tank, rated up to 100 cups an hour
- Sparkling
- Carbonated with CO₂ on demand
- Ambient
- Filtered, room-temperature water
- Tap shapes
- S1 or C1, in premium finish options
- Undersink unit
- 23 × 43.5 × 39.5 cm (W × D × H)
- Power
- 0.5 kW cold side, AC 110-220 V, 50/60 Hz
- Build
- NSF-rated, with auto power-down when idle
- Warranty
- 1 year, manufacturer
What it does.
- Instant chilled, sparkling and ambient filtered water from one touch-button tap
- 2.5 L chilled tank, rated up to 100 cups per hour
- Sparkling water carbonated with CO₂ on demand
- S1 or C1 tap shapes, in premium finish options
- Intelligent eco mode with auto power-down
- Compact 23 cm wide undersink unit
Typical applications
Who the RoyalFlow CSA is for
- Offices and meeting rooms that want chilled, sparkling and ambient filtered water from a tap, with no bottles or bulky unit on the worktop.
- Hospitality sites and commercial kitchens with heavy use, since the chilled tank is rated up to 100 cups an hour.
- Healthcare sites that want an NSF-rated build and a simple touch interface.
- Smaller commercial sites that have a sink cabinet with room for a unit 23 cm wide.
- Buyers who care about the look: you choose the S1 or C1 tap shape and a premium finish.
How the RoyalFlow CSA Smart Tap works
The datasheet shows five steps from mains to glass: the municipal mains, a treatment system, the chill tank, CO₂ carbonation and touch-tap dispense. Mains water passes through treatment if you have specified it, then fills the 2.5 litre chilled tank in the undersink unit. Sparkling water is carbonated with CO₂ on demand, and ambient water is filtered, room-temperature water.
An efficiency controller powers the unit down during periods of inactivity. The datasheet says this saves energy without losing responsiveness. The cold side is rated at 0.5 kW on AC 110-220 V at 50/60 Hz.
Treatment is optional and sold separately. The datasheet says it can be customised for regional water profiles, including reverse osmosis where required. For why that matters, see our guide to filtration versus treatment.
Which one should you choose?
RoyalFlow is a range, and other makers have capable taps too. We settle the choice at survey, from your headcount, your cabinet space and your water.
RoyalFlow CSA
You want chilled, sparkling and ambient from a tap on the sink, at a smaller commercial site, from our own range.
RoyalFlow CA
You do not need sparkling. The CA gives chilled and ambient from the same tap and tank.
RoyalFlow BCS Smart Tap
You want boiling as well, so one tap replaces the kettle, the cooler and the bottled fizz.
CrownFlow BCS
You would rather have a countertop unit with boiling, chilled and sparkling water.
BRITA Top Pro
You have a larger or busier site, up to 100 regular users, and want a BRITA unit.
Installation and servicing
The undersink unit measures 23 × 43.5 × 39.5 cm (width × depth × height), so check the cabinet before you order. The datasheet lists the scope of supply: the smart tap and undersink unit in S1 or C1 tap shape, the touch-button tap with premium finish options, and the connection fittings for the municipal water supply.
Sparkling water needs a CO₂ supply on site. We confirm the CO₂ arrangement, the tap shape, the finish and the cabinet layout with you at survey. A Sovereign treatment system and a Comprehensive Maintenance plan are optional extras. The survey is chargeable and is credited back if you go ahead.
The unit carries a 1 year manufacturer warranty. Sovereign Water supplies, fits and services it.
RoyalFlow CSA Smart Tap questions answered
What is the RoyalFlow CSA?
A commercial-grade undersink smart tap that gives instant chilled, sparkling and ambient filtered water from one touch-button tap.
What does CSA stand for?
Chilled, sparkling and ambient: the three water types the tap gives.
How many cups an hour does it give?
The 2.5 litre chilled tank is rated for up to 100 cups an hour.
How is the sparkling water made?
It is carbonated with CO₂ on demand. The unit has a CO₂ carbonation step between the chill tank and the tap.
Does it give boiling water?
No. For boiling, chilled and sparkling, see the RoyalFlow BCS.
How big is the undersink unit?
23 × 43.5 × 39.5 cm (width × depth × height).
How much power does it use?
The datasheet gives 0.5 kW for the cold side, on AC 110-220 V at 50/60 Hz. An efficiency controller powers the unit down when it is idle.
What tap shapes and finishes are there?
S1 or C1 tap shapes, with premium finish options. We confirm the finish with you before ordering.
Is it NSF-rated?
The datasheet describes the construction as NSF-rated.
Does it need water treatment?
Treatment is optional and sold separately. A Sovereign treatment system can be customised for your local water, including reverse osmosis where required.
What warranty does it have?
One year, from the manufacturer. You can add a Comprehensive Maintenance plan.
Do you supply, fit and service it?
Yes. We supply it, fit it and service it. The survey is chargeable and is credited back if you go ahead.
Related products
Figures come from the manufacturer datasheet (PDF). Reviewed November 2026.
Supplied, installed and serviced across the UK
Across most of southern and eastern England, mains water is very hard. Rain filtering through chalk and limestone dissolves calcium and magnesium, and that scale coats heating elements, so we size every system to your supply and your equipment.
Tell us about your site and what you need the water for. We specify the system, fit it and keep it running under Comprehensive Maintenance.
Source: Drinking Water Inspectorate, Drinking Water Quality in England triennial report (2020–2022).
Interested in the RoyalFlow CSA Smart Tap?
Tell us your setup and we'll specify, supply, install and service the right configuration for your site.
