If you’ve ever remodelled a bathroom, you already know that choosing a toilet is not just about looks. It’s about comfort, function, and a little bit of pride in your space. Two of the most popular options today are one piece toilets and the smart toilet. But which one is right for you? And more importantly, how do you install them without calling your plumber three times in one afternoon?

Grab a coffee, roll up your sleeves, and let’s break this down step by step; from installation and setup to maintenance and performance. I’ve been through this process more times than I can count, and trust me, a few insider tips can make all the difference.

What are one piece toilets and smart toilets?

Before you even touch a wrench, it’s essential to know what you’re working with.

What is a one piece toilet?

A one piece toilet is exactly what it sounds like: the tank and the bowl are moulded together as a single unit. No joints, no separate pieces, no complicated connections. This design makes it incredibly sleek and modern-looking, but also practical. The fewer seams there are, the fewer places grime can hide.

Most homeowners love one piece toilets for their minimalist style and easier cleaning. I often tell people that if you hate scrubbing around the base or tank (and who doesn’t?), this is your friend.

Quick pros

• Easier to clean
• Fewer leak points
• Sleek, modern design

Potential cons

• Heavier and harder to move
• Slightly more expensive upfront
• Limited customisation

What is a smart toilet?

Now, let’s talk about the fancy cousin: the smart toilet. Imagine your toilet had a brain, a bidet, and a spa day all rolled into one. That’s basically what you’re getting.

A smart toilet is equipped with features like heated seats, built-in bidets, automatic flushing, night lights, and even air dryers. Some advanced models can open the lid for you or connect to an app for water usage tracking (yes, really).

Quick pros

• Luxurious comfort
• Enhanced hygiene
• Eco-friendly water efficiency

Potential cons

• Complex installation
• Requires electricity
• Pricier repairs and parts

So, while one piece toilets focus on simplicity and cleanliness, smart toilets bring innovation and comfort to the table; or rather, to the bathroom.

Tools you’ll need before you start

Installing either type of toilet doesn’t require an engineering degree; just patience and preparation. Here’s a simple checklist that’ll save you from unnecessary frustration mid-project.

Basic toolkit

• Adjustable wrench
• Wax ring or rubber seal
• Level
• Screwdriver set
• Measuring tape
• Water supply line
• Teflon tape
• Bucket and towel (trust me, you’ll need them)

If you’re installing a smart toilet, you’ll also need:

• A nearby electrical outlet
• A voltage tester
• Cable clips or conduit for safety

Step-by-step installation for one piece toilets

Alright, let’s start with the classic. Installing a one piece toilet is usually simpler than people think; especially compared to the two-piece models of the past.

1. Prep the area: First, turn off the water supply and flush the old toilet to drain out as much water as possible. Use a sponge or towel to soak up any leftover water in the tank and bowl. Then, remove the old toilet and clean the flange area thoroughly. You want a clean, even surface for a watertight seal.
2. Install the wax ring: Place the wax ring onto the flange opening on the floor. The wax ring creates a seal between the toilet and the sewer pipe; so make sure it’s centred and pressed down slightly. Pro tip: If your bathroom tends to get warm, chill the wax ring in the fridge for 15 minutes first. It’ll be easier to handle and less likely to deform.
3. Set the toilet: Carefully lower your one piece toilet straight onto the flange, aligning the bolts with the holes on the base. Don’t rock it back and forth; instead, press straight down to ensure the wax ring seals properly. Once it’s in place, tighten the nuts evenly on both sides; not too tight, though. Over-tightening can crack the porcelain (and that’s an expensive mistake).
4. Connect the water supply: Attach the water supply line to the tank’s fill valve, apply Teflon tape for a snug fit, and turn on the water slowly. Let the tank fill, then flush a few times to check for leaks. If everything’s dry and steady, you’re good to go. Give yourself a pat on the back; you just installed your one piece toilet like a pro.

Step-by-step installation for smart toilets

Now for the fun part: installing a smart toilet. It’s a little more technical, but the end result is pure bathroom luxury.

1. Check your power source: Since a smart toilet requires electricity for its features (bidet, seat warmer, etc.), make sure there’s a GFCI outlet nearby. If there isn’t, consider hiring an electrician to install one. Don’t risk using an extension cord. It’s unsafe in a moisture-prone area.
2. Mount the base or bracket: Some smart toilets come with a wall or floor bracket that needs to be installed before the main unit. Follow the manufacturer’s instructions carefully; precision matters here. Use a level to ensure it’s perfectly aligned.
3. Connect the plumbing: Attach the water supply line as you would with a regular toilet. However, smart toilets often have an additional connection for the bidet function. Make sure both are secure and leak-free. If your model includes a water filter, install it inline to prevent sediment buildup. It’ll prolong the lifespan of your toilet.
4. Plug it in: Once your plumbing is secure, plug the smart toilet into the outlet. You should see indicator lights or hear a soft hum as it powers up. Run a few test cycles: open and close the lid, activate the bidet, and check water temperature and pressure.

Maintenance tips

For one piece toilets

Maintaining a one piece toilet is refreshingly simple. Regular cleaning with non-abrasive cleaners will keep it looking pristine. Avoid harsh chemicals that can damage the porcelain glaze.

Inspect the flush valve and flapper every few months. These are inexpensive parts that can wear down over time and cause leaks or weak flushes.

For smart toilets

A smart toilet, while more advanced, also requires gentle care. Wipe the seat and sensors with a soft cloth. Use mild, non-corrosive cleaners to avoid damaging the electronic components.

If your model includes a self-cleaning nozzle or deodoriser filter, follow the manufacturer’s replacement schedule. Don’t ignore filter warnings. They’re there for hygiene and efficiency.

Pro tip: Keep an eye on firmware updates (yes, some smart toilets have them). Manufacturers often release updates to improve performance or add features.

Common mistakes to avoid during installation

Even experienced DIYers slip up occasionally. Here are some frequent errors to steer clear of:

For one piece toilets

• Overtightening bolts: This can crack the ceramic. Tighten until snug, not until you can’t move your hand.
• Skipping the wax ring test: If you don’t press-test before securing bolts, you may end up with hidden leaks later.
• Uneven floors: A rocking toilet can break seals and cause leaks. Shim it if necessary.

For smart toilets

• Ignoring the power setup: Never use non-GFCI outlets. It’s a major safety hazard.
• Mismatched plumbing connectors: Always check for compatible fittings, especially for bidet lines.
• Skipping the setup guide: Each smart model is unique. Assume nothing and follow the manual religiously.

What you should expect to spend

One piece toilets

The average one piece toilet ranges from $250 to $800, depending on the brand and design. Installation costs, if done professionally, hover around $150–$300.

Smart toilets

A smart toilet starts around $800 but can easily reach $3,000 or more for high-end models with features like automatic lids, remote controls, and self-sterilising nozzles. Professional installation typically adds $300–$600, mainly due to the electrical work involved.

Which one should you choose?

Here’s the truth: there’s no universal “best” option. It depends entirely on your lifestyle, budget, and priorities.

If you value simplicity, ease of cleaning, and durability, one piece toilets are unbeatable. They fit beautifully into modern, minimalist bathrooms and require minimal maintenance.

If you’re drawn to comfort, technology, and luxury, the smart toilet is worth every penny. It’s not just about convenience. It’s about transforming your daily routine into something genuinely pleasant.

Personally? I installed a smart toilet in my master bath and a one piece toilet in the guest bath. That balance gave me the best of both worlds: practicality for guests and pure comfort for me.

The future of bathroom design

Whether you lean toward the reliable simplicity of one piece toilets or the high-tech sophistication of a smart toilet, one thing is clear: toilets aren’t what they used to be. They’ve evolved into design statements, health tools, and even eco-friendly devices that reflect your personal taste.

When installed correctly, both types offer years of reliable performance and style. So don’t rush the decision. Take your time, measure twice, and install once. Because the best bathroom upgrade isn’t just about function. It’s about how it makes you feel every single day.

Adam Mulligan, a psychology graduate from the University of Hertfordshire, has a keen interest in the fields of mental health, wellness, and lifestyle.