Bathtub to Shower Conversion: Make It a Smart Shower

The perfect moment to make the tech leap

Converting a bathtub to a shower is the most requested renovation in Spain. According to INE data from 2024, over 380,000 Spanish households make this conversion every year. But what surprises us at Bathscape is that the vast majority install a conventional shower identical — in technology — to one they could have installed in 1995.

When you remove the bathtub, the bathroom becomes a construction site. Pipes get changed, the floor is redone, drains are repositioned. In other words, access to the installation is completely open. Adding technology at that point costs a fraction of what it would cost afterward. And yet, almost nobody takes advantage of it.

This article isn’t about convincing you to swap your bathtub. You’ve already decided that. It’s about not wasting the opportunity to install a shower that actually belongs in 2026.

Three levels of smart shower

There isn’t a single version of “smart shower.” There’s a wide spectrum, and each level makes sense for different profiles and budgets. At Bathscape, we work with three clear tiers.

Level 1: Thermostatic (the smart baseline)

Thermostatic faucets are, technically, the first level of shower intelligence. No WiFi, no app, but something that matters more: a thermostatic cartridge that maintains constant temperature with ±1°C precision.

What’s included:

• Thermostatic mixer with safety lock at 38°C
• Time to target temperature: 1-2 seconds
• Automatic compensation for pressure changes (someone opens another faucet and your shower doesn’t suffer)
• Estimated water savings: 7-15% compared to conventional single-lever

Faucet investment: 300-600 € depending on brand and model. A Grohe Grohtherm 1000 runs around 350 €. A Hansgrohe ShowerSelect concealed model, about 500 €.

Our take: If your budget is tight, this is the minimum you should install. The comfort difference versus a single-lever is dramatic, and the added cost over basic faucets pays for itself in water savings in under two years.

Level 2: Digital (visible controls)

Here the shower starts displaying data. A digital panel controls temperature and flow with precision, allows user profiles, and shows real-time consumption.

What’s included:

• Concealed digital panel (touchscreen or physical buttons)
• User profiles: each person sets their preferred temperature and flow
• Real-time temperature display
• Water consumption indicator per shower
• Remote start: water begins flowing while you undress

Faucet and panel investment: 600-1,200 €. The Grohe SmartControl system is a benchmark in this range. Hansgrohe offers similar solutions with their RainSelect line.

Critical technical detail: these systems require electrical power in the shower zone. That means a cable from the circuit panel to behind the control panel, with a dedicated 30mA residual current device. If your current bathroom doesn’t have an electrical outlet near the shower, the renovation is the time to run that cable. Afterward, with everything tiled, it’s impractical without demolition.

Level 3: Full Smart (connected ecosystem)

The highest level integrates the shower into the home automation ecosystem. Voice control, scheduling, long-term consumption statistics, and personalized scenes.

What’s included:

• Everything from Level 2
• Mobile app control (iOS/Android)
• Voice assistant integration (Alexa, Google Home, Siri)
• Consumption history with weekly and monthly statistics
• Programmable scenes: “Morning Shower” (38°C, medium flow, white light), “Relaxation Shower” (40°C, gentle flow, amber light)
• Abnormal consumption detection (possible leak)

Total system investment: 1,200-3,000 € depending on complexity. The Hansgrohe RainTunes is probably the most complete system on the market: it controls water, light, and sound from a single app.

Installation requirements: Stable WiFi in the bathroom (may require a repeater or additional access point), dedicated electrical supply, and in some systems, a control module installed in an accessible utility space.

Technology components: what can be added

Beyond the faucets, there are standalone components that turn a standard shower into a technological experience. These can be combined with each other and with any of the three levels above.

Digital valve

The brain of the system. It replaces the conventional concealed body and allows temperature, flow, and water distribution control between different outlets (rain showerhead, hand shower, body jets) from a panel or app. Brands like Grohe and Hansgrohe manufacture valves compatible with their digital ecosystems.

The digital valve is the first decision to make, because it determines the rest of the installation: pipe diameters, number of outlets, and type of electrical supply.

LED chromotherapy

RGB LED strips integrated into the shower niche, around the tray perimeter, or in the rain showerhead. Chromotherapy isn’t decoration: studies published in the Journal of Environmental Psychology associate blue light with reduced heart rate and amber light with improved perceived sleep quality.

Showerheads with integrated LEDs work via hydraulic turbine (the water flow itself generates electricity), so they don’t need an electrical cable. Niches and perimeters do require power, but with 12V LED strips the installation is simple and safe.

Cost: 80-300 € depending on whether it’s just the LED showerhead or a complete chromotherapy system for the shower zone.

Waterproof Bluetooth speaker

A built-in speaker with IPX7 or higher certification. It integrates into the ceiling or shower wall and connects to your phone via Bluetooth. Some systems like Hansgrohe’s RainTunes integrate it directly into the rain showerhead.

Let’s be honest here: a built-in speaker sounds better than a portable one perched on the shelf, but it doesn’t replace a proper sound system. For podcasts and background music in the shower, it’s more than adequate.

Cost: 60-250 € installed.

Body jets (lateral jets)

They’re not digital technology per se, but combined with a digital valve they become a programmable system: pressure, temperature, and activation sequence controlled from the panel or app. Two or three pairs of lateral jets at different heights create a surround effect that rivals the old hydro-massage cabins, but without the maintenance issues.

Cost: 200-600 € per pair of jets, plus hydraulic installation.

Installation: what your installer needs to know

Electrical requirements

A Level 2 or 3 smart shower requires, at minimum:

• Dedicated electrical line from the circuit panel to the shower zone
• 30mA residual current device specific to the bathroom circuit
• Sealed junction box (IP65 minimum) behind the control panel
• Cable gauge: 2.5 mm² for the main bathroom line

All of this is regulated by the REBT (Low Voltage Electrical Regulation), which defines electrical safety zones in the bathroom. Zone 1 (directly above the shower) only allows elements with IPX5 or higher protection.

WiFi in the bathroom

Tiles, humidity, and brick walls are enemies of WiFi. In many Valencia apartments — especially those in the Ensanche or Ruzafa with half-meter load-bearing walls — the router signal from the living room reaches the bathroom barely alive. A WiFi repeater or, better yet, a wired Ethernet access point solves the problem.

Practical tip: if you’re already doing the renovation, run a Cat6 Ethernet cable from the router to a point near the bathroom. It’s a 30-50 € expense in cable that will save you headaches with all connected devices.

IP rating (water protection)

Every electrical component in the shower zone must have an appropriate IP rating:

Zone	Distance	Minimum rating
Zone 0	Inside bathtub/tray	IPX7
Zone 1	Up to 2.25m above tray	IPX5
Zone 2	60cm around zone 1	IPX4
Zone 3	Rest of bathroom	IPX1

Be careful buying generic “smart” devices designed for the kitchen or living room. If they don’t carry the appropriate IP certification for the zone where you’ll install them, you’re creating a safety hazard.

Specific products we recommend

After over a hundred installations, these are the products that have given us the best results:

For Level 1 (thermostatic):

• Grohe Grohtherm 1000 (concealed): reliable, easy-to-find replacement parts, long-lasting cartridges
• Roca T-1000: good quality-price ratio, locally accessible technical service in Valencia

For Level 2 (digital):

• Grohe SmartControl: intuitive panel, solid build, wide range of finishes
• Hansgrohe ShowerSelect with integrated thermostat: minimalist design, excellent ergonomics

For Level 3 (full smart):

• Hansgrohe RainTunes: the most complete system, integrates water + light + sound
• Grohe Ondus + SmartControl: modular ecosystem, allows incremental component addition

What it actually costs: breakdown by level

This is what you’d pay over and above a basic conventional shower, including installation:

Item	Level 1	Level 2	Level 3
Faucets	300-600 €	600-1,200 €	1,200-2,500 €
Additional electrical installation	0 €	150-300 €	200-400 €
LED chromotherapy	Optional: 80-300 €	Optional: 80-300 €	Included
Speaker	—	Optional: 60-250 €	Included
WiFi/connectivity	—	—	50-150 €
Total added cost	300-900 €	810-2,050 €	1,450-3,050 €

These are added costs over a conventional installation. That is, if your bathtub-to-shower conversion costs 3,500 € with basic faucets, with Level 1 you’d be at 3,800-4,400 €, and with Level 3 at 4,950-6,550 €.

Frequently asked questions

Can I install smart technology if my bathroom is small?

Yes. Technology doesn’t take up visual space. Digital panels are concealed in the wall, LEDs are hidden in profiles, and speakers go in the ceiling. In fact, in small bathrooms technology can be even more useful: a digital valve eliminates the faucet handle and frees up wall space.

What happens if the digital system fails? Am I left without a shower?

Reliable brand systems from Grohe and Hansgrohe always include a mechanical bypass. If the electronics fail, you can continue using the shower with manual control. It’s not common — the failure rate is very low — but the safety net is there.

Can Valencia’s hard water damage digital components?

Valencia’s water has medium-high hardness (around 30-35°F according to EMIVASA data). This affects conventional faucets more than digital ones, because thermostatic cartridges and digital valves typically have integrated filters. Even so, we recommend installing a general water softener or, at minimum, an anti-scale filter on the bathroom water inlet.

Is Level 3 worth it or is it “too much technology”?

It depends on your profile. If you already use home automation (Alexa, Google Home, automated blinds), Level 3 integrates naturally. If your smartphone feels complicated, stay at Level 1. There’s no universal answer, but what is universal: installing the electrical infrastructure now (even if you don’t connect the devices yet) is always a good idea. Cable is cheap; breaking tiles to run it later is not.

The time is now (literally)

Look, it’s simple: if you’ve already decided to convert the bathtub to a shower, 80% of the work for a smart shower is going to happen anyway. Walls will be opened, pipes will be changed, tiles will go back up. Running an additional electrical cable or provisioning a data outlet costs, literally, a few extra euros.

What makes no sense at all is renovating the bathroom today with twenty-year-old technology and, three years from now, wanting to add a digital panel and having to tear everything apart again.

At Bathscape, we’ve been saying it for a while: a bathroom renovation shouldn’t be a patch job. It should be a 15-20 year investment. And on that timeline, technology isn’t a luxury. It’s common sense.

Configure your smart shower in our online configurator and discover which level fits your budget and lifestyle. You can also explore our smart-tech designs to see real examples of smart showers installed in Valencia bathrooms.

If you want to better understand the real cost of a bathroom renovation, we have an article with detailed data that will be useful before making decisions.

And if you’re interested in how our renovation process works from start to finish, visit our how it works page.