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Electric Shower Cabins vs Plumbed and Steam: How They Differ
By admin | Product Reviews
By admin | Product Reviews
Electric shower cabins need only a cold water feed and heat water on demand… no hot-water plumbing required. Plumbed (hydro) cabins mix hot and cold supply through a thermostatic valve and many models need no electrics at all. Steam cabins need that same hot-and-cold plumbing plus a dedicated electrical supply for the generator.
You’ve narrowed it down to a shower cabin. Good start. But “electric,” “plumbed” and “steam” all turn up in the same search results, and nobody’s told you they need genuinely different things from your bathroom.
By the end of this you’ll know which category actually fits what you’ve already got… pipework, wiring, and the size of job either one triggers. We’ll cover what each type needs from your plumbing, what each needs from your electrics, and which one to shortlist first. None of that’s obvious from a product photo, so we’re going category by category, starting with the one that asks the least of your existing pipework.
Here’s what actually matters: an electric shower cabin only ever needs a single cold water feed. No hot-water pipe run, no mixing valve, no waiting on the boiler to catch up.
The unit heats the water itself, on demand, using its own electric heating element. That’s the whole appeal for a bathroom with awkward or expensive-to-extend hot-water pipework… there’s nothing to extend.
Vidalux’s Pure E range is SPW’s own electric cabin line, built exactly to that cold-feed-only principle. Each Pure E cabin accepts a third-party electric shower unit, mounted to the shower column, with a hole formed in the centre column for the water inlet pipe. Pure E units ship fitted with a Triton electric shower unit rated at 8.5kW or 9.5kW, depending on the model. The electric shower’s own warranty sits with its manufacturer, not with Vidalux.
Cabins in the range come in a choice of panel colours – White, Black and Mirrored with the Triton unit finishes of… Standard, Lux Metal, Lux White and Lux Black. This whole model line is built to a quick-build design carrying its own leak-free guarantee.
This is exactly why electric cabins turn up so often in loft conversions, annexes and self-contained en-suites… rooms that were never plumbed for hot water in the first place, where extending the run would mean lifting floors just to get a shower installed at all.
Worth knowing: “no hot-water plumbing” doesn’t mean “no electrics.” An electric cabin still needs its own properly rated electrical circuit for the shower unit itself, fitted by a Part P-registered electrician, same as any electric shower fitted anywhere else in the house.
If you want the exact mechanics of how the cold-feed setup works, we’ve written that up in full in our Pure E cold water feed guide.
Buy for the room you’ve got, not the one in the photo. An electric cabin solves a hot-water-access problem. It doesn’t solve a footprint problem, and the size you need still has to match the space you’re fitting it into.
Quick check before you order: “plumbed” doesn’t mean “more wiring.” It’s the opposite of what most people assume.
A plumbed, or hydro, shower cabin needs a hot and cold water feed running to a thermostatic mixer valve… the same mixing job a normal bath tap does, just built into the cabin. There’s no generator, no control panel, and no steam capability sat behind the glass.
So what does that mean for your electrics? Often, nothing at all. Most hydro cabin models are purely mechanical, plumbing-only product, and it runs entirely without a mains connection. The one exception is a cabin fitted with extras… Bluetooth speakers or built-in lighting. Those need a standard plug for the extras themselves, never for the water functions, which stay fully mechanical either way.
Think of it like a normal shower with a smarter tap. The plumbing does all of the real work, and the electrics do none of it unless you’ve deliberately chosen a model with add-ons.
SPW’s hydro range spans three brand families… Insignia, Vidalux and Lisna Waters. Each brings a different look and finish, but the underlying plumbing-only mechanic doesn’t change from one to the next, which is worth knowing before you shortlist on looks alone.
Ready to see what fits? Browse our full range of shower cabins and hydro showers, spanning Insignia, Vidalux and Lisna Waters.
Does a plumbed cabin need any electrics at all? Only if it has extras like Bluetooth or lighting… the water functions themselves run on plumbing alone.
Straight answer: a steam cabin is the one category that needs both. The same hot-and-cold plumbing as a hydro cabin, plus a dedicated electrical supply for the generator.
That combination is exactly where most of the confusion in this comparison lives. A steam cabin needs more than a hydro cabin’s plumbing alone… the generator is a separate unit, with its own circuit, entirely apart from the water side of the job.
A steam shower’s only as good as the generator inside it. Generator size (its kW rating) varies model to model, which is exactly why this piece stops at the principle rather than a single figure.
We’re not going to give you the amp rating, the RCD detail or the exact circuit spec here, on purpose. Those figures depend on the specific model you’re looking at, and getting them wrong is exactly the kind of thing that costs you a return, or worse, a failed inspection. SPW’s own plumbing and electrical requirements guide covers the full spec… amp rating, RCD, pipe positioning, water pressure… before you order.
Under Part P of the Building Regulations, electrical work in a bathroom has to be carried out, or checked and certified, by a competent, registered electrician. That applies to a steam cabin’s generator circuit just as it applies to any other bathroom electrical work.
If you’re replacing a cabin that’s already got both plumbing and power run to it, none of this is new work at all… you’re just matching the incoming supply to what the new unit needs, not starting from scratch.
Worth pricing in before you commit: according to MyBuilder’s own steam shower cost guide, a professional steam shower install typically runs £1,200-£2,500, with the electrical work alone accounting for £200-£400 of that, and £2,500-£10,000 for the full project once the cabin and any wider room work are included. There’s no equivalent, reliably sourced figure for electric-only installation available to us right now… the job’s smaller by nature, but we’re not going to invent a number to fill the gap.
Water fittings on any hot-and-cold connection, hydro or steam, also need to meet UK water regulations… Water Regs UK publishes the guidance on what those regulations require.
Browse steam showers once you know that’s the category for you.
One thing to measure first: what’s already running to the room, not what you’d like to be running to it.
Will changing category mean ripping out my existing pipework? It depends which direction you’re moving. Going from steam to electric usually removes work… you’re stripping a generator circuit out, not adding one. Going from electric to steam usually adds it, since you’re introducing hot-water plumbing and a dedicated circuit that weren’t there before.
Is electric actually enough shower for a family bathroom? That’s not a question this article can answer honestly with a sourced figure, and we’re not going to guess. It’s a question for the specific model’s own spec sheet, not a category-level generalisation.
None of this is a one-way decision either. It’s entirely normal to start out planning a straightforward hydro cabin and, once you know your room can support it without extra first-fix work, decide the extra features of a steam cabin are worth having after all.
If you’re planning this on a client’s behalf rather than for your own bathroom, the same three questions apply… just aimed at their existing pipework and consumer unit capacity, not yours.
For a full walk-through of cabin sizing and footprint, our shower cabins guide covers that in more depth.
Cheapest first, best-fit second is how returns happen. This article can tell you what each category needs from your bathroom. It can’t tell you what your bathroom’s actually got… that’s a question for whoever’s fitting it, tape measure in hand, not a spec sheet.
Bottom line… three categories, three different asks of your bathroom. If there’s no hot water in the room, electric removes the problem outright. If the plumbing’s already there and you don’t want the extras, plumbed (hydro) is the simplest of the three to live with. If the plumbing’s there and you want the full experience, steam’s viable… just budget the professional install alongside it. SPW’s stocked all three categories since 2006, family-run throughout… whichever one fits, its own section above (electric, plumbed, or steam) links straight through to the current range.
A few of the specific questions this comparison throws up, answered directly:
Q: Does an electric shower cabin need hot water plumbed in?
A: No … electric cabins like Vidalux’s Pure E range run on a single cold water feed and heat the water on demand. See our Pure E cold-water-feed guide for exactly how that works.
Q: Does a plumbed shower cabin need any electrics?
A: Usually not. A plumbed (hydro) cabin runs on a mechanical thermostatic mixer valve alone. The only exception is a cabin with Bluetooth or lighting, which needs a standard plug for those extras, never for the water functions.
Q: Does a steam shower cabin need extra electrics as well as plumbing?
A: Yes … a steam cabin needs the same hot-and-cold water feed as a plumbed cabin, plus a dedicated electrical supply for the generator, fitted by a Part P-registered electrician. See our plumbing and electrical requirements guide for the exact spec.
Q: What’s the real difference between a hydro cabin and a steam cabin?
A: A hydro cabin gives you a powered, mixed-temperature shower with no generator and (normally) no electrics. A steam cabin adds a built-in steam generator, which is what brings in the extra electrical requirement.