A hot and sparkling water tap replaces the kettle, the water cooler and the crates of fizzy bottles with one outlet at the sink. The RoyalFlow range covers several versions of that idea, from a commercial tap that pours boiling, chilled and sparkling water to a home tap that also runs your normal hot and cold. This guide explains which model suits which kitchen, office or home, what each one needs under the counter, and what to ask before you order.
TL;DR
- RoyalFlow splits into commercial taps (BCS, BC, BA, CA, CSA) and residential taps (C2, C4).
- The BCS is the full commercial hot and sparkling water tap: boiling, chilled and sparkling from one spout.
- If you do not need fizz, the BC (boiling and chilled) or BA (boiling and ambient) keeps things simpler.
- If you do not need boiling water, the CA and CSA give chilled, ambient and (on the CSA) sparkling water.
- The C2 and C4 are for homes. They add normal hot and cold to the drinking waters.
- Every model needs a cold feed, an isolation valve and a switched, fused socket under the counter.
Not sure which model fits? Talk to Our Team and we will match the tap to your site.
Contents
- How the RoyalFlow range is split
- Which hot and sparkling water tap suits an office?
- Commercial models side by side
- The residential taps: C2 and C4
- What the installer needs under the counter
- Questions to ask before you order
- Frequently asked questions
- Sources
How the RoyalFlow range is split
The quickest way to read the range is to ask two questions. Is the tap for a workplace or a home? And which waters do people actually drink?
The commercial models are built around a single drinking-water tap with an under-sink unit. They suit offices, staff kitchens, meeting floors, hospitality and other shared spaces. The residential models do the same job for a household, but the tap also mixes your ordinary hot and cold from the domestic supply, so it can replace the existing kitchen tap.
Each commercial model's letters tell you what it pours:
- B is boiling
- C is chilled
- S is sparkling
- A is ambient (room temperature, filtered)
So a BCS pours boiling, chilled and sparkling. A CA pours chilled and ambient. The full commercial range is on our hot and sparkling water tap page.
Which hot and sparkling water tap suits an office?
For most offices that want all three drinks, the RoyalFlow BCS Smart Tap is the one to look at first. Per the manufacturer's datasheet, it holds a 3 litre boiling tank rated at around 125 cups an hour and a 2.5 litre chilled tank rated at around 100 cups an hour, with sparkling water drawn from the chilled supply. The under-sink unit measures 230 × 435 × 395 mm, so check the cupboard before anything else.
That output is aimed at a shared kitchen, not a single desk. If your floor has one busy tea point serving a team, the BCS replaces both the kettle and the bottled fizz in one go. If you are weighing up whether a tap beats bottled sparkling at all, our guide to sparkling water in the office sets out that comparison, and our boiling water tap vs kettle guide covers the hot side.
Some sites do not need every water. Dropping one saves power and keeps the under-sink kit simpler:
- No fizz wanted? The BC gives boiling and chilled.
- Only tea and coffee, plus a glass of water? The BA gives boiling and ambient, with no chiller at all.
- No boiling water wanted (for example a gym, clinic waiting area or reception)? The CA gives chilled and ambient, and the CSA adds sparkling.
The commercial taps come in two spout styles, a curved swan neck (C1) and a square neck (S1), so you can match the look of the kitchen.
Want a second opinion on sizing? Request a Quote and tell us how many people share the kitchen.
Commercial models side by side
The figures below come from the RoyalFlow datasheets. Cups per hour are the manufacturer's ratings.
| Model | Waters | Boiling tank | Chilled tank | Rated power |
|---|---|---|---|---|
| BCS | Boiling, chilled, sparkling | 3 L, ~125 cups/h | 2.5 L, ~100 cups/h | 1.5 kW (1 kW hot, 0.5 kW cold) |
| BC | Boiling, chilled | 3 L, ~125 cups/h | 2.5 L, ~100 cups/h | 1.5 kW |
| BA | Boiling, ambient | 3 L, ~125 cups/h | None (ambient is direct) | 1 kW |
| CA | Chilled, ambient | None | 2.5 L, ~100 cups/h | 0.5 kW |
| CSA | Chilled, sparkling, ambient | None | 2.5 L, ~100 cups/h | 0.5 kW |
Two points stand out. First, the boiling element is the biggest draw, so a model without boiling water has a much smaller electrical load. Second, the sparkling models need a CO2 supply, which becomes a regular consumable. Ask who replaces the cylinder and how often your usage will need it.
For a wider look at office options, including countertop and floor-standing units, see our office water dispensers buyer's guide.
The residential taps: C2 and C4
The C2 and C4 are home taps. Do not specify them for a workplace kitchen.
The RoyalFlow C2 pours boiling, chilled, sparkling and ambient drinking water, plus your normal hot and cold. Its datasheet lists a 2 litre boiling tank (around 75 cups an hour) and 1.5 litre chilled and sparkling tanks (around 50 cups an hour), with 0.7 kW on the hot side and 0.3 kW on the cold.
The C4 uses the same tank sizes in a C-shaped spout with a colour-coded rotating control. The datasheet describes it as suiting households of up to 8 people. It has a hot-water safety lock: the control blinks red and must be turned again within 3 seconds before boiling water flows. It needs a worktop hole of 32 to 35 mm.
Both residential models are on our RoyalFlow residential page.
What the installer needs under the counter
RoyalFlow's connection document sets out the basics. Share this list with whoever manages the kitchen before the survey:
- An 8 mm drinking-water connection from the cold mains
- An isolation valve on the cold feed, left accessible for maintenance
- A switched, fused electrical outlet inside the under-counter space
- A drain connection where the model needs one
- Enough cupboard room for the under-sink unit, plus air around it
- On the CSA and BCS, space for the CO2 cylinder
The outlet pipe comes in C-type or U-type shapes. The installer should not rotate it more than 180 degrees.
Anything connected to the mains in the UK has to meet the Water Supply (Water Fittings) Regulations 1999. WRAS publishes guidance on what that means for installers. If your site is in a hard water area, check your area on our water hardness page. Every RoyalFlow datasheet notes the tap can be paired with a Sovereign treatment system, sold separately, which helps protect the boiler from scale.
Questions to ask before you order
- How many people use the kitchen at its busiest time? This decides whether the tank output is enough.
- Which waters will people really drink? Paying for a chiller or CO2 nobody uses adds cost and upkeep.
- Is there power and a cold feed in the cupboard? If not, add that work to the plan.
- Who changes the filter and CO2? Ask for it in writing.
- What is the warranty, and what does a service visit cover? Our Comprehensive Maintenance plan can cover filter changes and servicing on a set schedule.
- Who handles the survey? Our site survey is chargeable, and it confirms the space, feed and power before installation.
Employers also have a legal duty here. Regulation 22 of the Workplace (Health, Safety and Welfare) Regulations 1992 requires an adequate supply of wholesome drinking water, and the HSE's brief guide explains what that means in practice. A tap is one way to meet it, not the only way.
Frequently asked questions
What is a hot and sparkling water tap?
It is a single tap that pours boiling water and carbonated (sparkling) water, usually with chilled water too. A unit under the sink heats, chills and carbonates mains water. The RoyalFlow BCS is the commercial version.
Which RoyalFlow tap is best for an office?
For a shared kitchen that wants boiling, chilled and sparkling water, the BCS. If you do not need fizz, the BC. If you only need boiling and filtered room-temperature water, the BA.
Can I use the C2 or C4 in a workplace?
No. They are residential models. For a workplace, choose from the BCS, BC, BA, CA or CSA.
Does a sparkling tap need CO2?
Yes. The BCS and CSA carbonate water with CO2, so the cylinder is a regular consumable. Plan who replaces it.
What power does a RoyalFlow tap need?
A switched, fused outlet under the counter. Rated power ranges from 0.5 kW on the CA and CSA up to 1.5 kW on the BCS and BC, per the datasheets.
Ready to choose?
Tell us how many people use the kitchen, which waters they want and what is under the sink. We will recommend the right RoyalFlow model and plan the installation. Get in Touch or Request a Quote.
Sources
- RoyalFlow product datasheets: BCS, BC, BA, CA, CSA, C2 and C4 (manufacturer, 2025). Available on request or via our datasheets page.
- RoyalFlow Connection Document, SWC-RF-INST-26-R0 (14 September 2025)
- Workplace (Health, Safety and Welfare) Regulations 1992, regulation 22
- HSE: Workplace health, safety and welfare, a brief guide (INDG244)
- WRAS: Water Regulations Advisory Scheme
- Drinking Water Inspectorate