Once you have settled on the shape and placement of your tub, one decision does more to define how it feels, how long it lasts, and what your renovation costs than almost any other: the material it is made from. The cast iron vs acrylic bathtub question comes up in nearly every bathroom project we consult on, and the honest answer is that neither material is universally "better" — they are built around genuinely different priorities. This guide goes deep on the two-material trade-off so you can match the tub to your home, your budget, and the way you actually bathe.
If you are still weighing tub styles, drop-in versus freestanding, or sizing for your room, start with our freestanding bathtub buying guide first, then come back here to settle the material. Below we compare weight and subfloor load, heat retention, feel, durability and repairability, and price — using Cheviot as our reference for cast iron and Maax for acrylic.
Cast iron vs acrylic bathtub: how each is made
A cast iron tub is exactly what it sounds like: molten iron poured into a mould, then finished with a fused porcelain enamel coating baked on at high temperature. That enamel is glass, essentially, which is why the surface is so hard and glossy. Brands like Cheviot have built their reputation on this old-world process, and a single tub can weigh several hundred pounds before you add water.
An acrylic tub starts as a sheet of coloured acrylic that is heated and vacuum-formed over a mould, then reinforced from behind with layers of fibreglass and resin. Maax, a Canadian manufacturer, produces acrylic tubs in a huge range of shapes precisely because the forming process is so flexible. The result is a warm-to-the-touch, lightweight shell that behaves very differently from enamelled iron.
Weight and subfloor load
This is the single biggest practical difference, and it often decides the whole project. A typical acrylic freestanding tub weighs roughly 60 to 120 lbs (27 to 54 kg) empty. A comparable cast iron tub can weigh 300 to 500 lbs (136 to 227 kg) empty — and once you add water and a bather, a cast iron soaker can push past 800 to 1,000 lbs (360 to 450 kg) concentrated over a small footprint.
For a slab-on-grade or basement installation, that load is a non-issue. On an upper floor over a standard joist system, it deserves a real conversation. Many second-floor framing systems handle a cast iron tub without modification, but it depends on joist size, spacing, span, and orientation — the tub's weight lands on a small area rather than being spread out. We routinely advise clients to have a contractor or structural engineer confirm the framing before ordering cast iron for an upper floor, and sometimes to add blocking or sistered joists. Acrylic sidesteps this concern almost entirely, which is why it dominates upper-floor and condo renovations. It is also far easier to carry up a staircase without damaging walls or risking injury — a genuine consideration when two people are wrestling a tub through a narrow GTA townhouse.
Heat retention and how the tub feels
Cast iron's reputation for a warm, enveloping soak is well earned, but the mechanism is often misunderstood. The metal itself is a good conductor, so it draws heat from the water quickly at first — which is why a cast iron tub can feel cold to the touch when empty and briefly cools the first splash of water. Once the mass is warmed through, however, it holds that heat and releases it slowly, giving long soaks a very stable, steady temperature. The thermal mass is the payoff.
Acrylic works the opposite way. It is a natural insulator, so it feels warm the moment you step in and never gives you that cold-metal shock. It does not store much heat, so a long soak will cool a little faster than in a fully warmed cast iron tub — though better acrylic tubs, including many from Maax, add insulation or optional in-line heaters to close much of that gap. For most bathers the real-world difference over a 20-minute soak is modest. If your ideal is a long, hot, undisturbed soak and you value that steady warmth above all, cast iron has the edge; if you want instant comfort and are topping up the hot water anyway, acrylic is perfectly satisfying.
Durability and repairability
Both materials are durable, but they fail in different ways. A cast iron tub's porcelain enamel is extremely hard, scratch-resistant, and easy to keep clean — it shrugs off decades of daily use. Its vulnerability is chipping: drop a heavy metal object and the glass enamel can crack or chip down to the iron, which will then rust if left bare. Repairs are possible with enamel repair kits or professional re-glazing, but a perfect invisible fix is difficult. The upside is longevity — a well-cared-for cast iron tub genuinely lasts generations, which is why they turn up intact in century homes across Ontario.
Acrylic is softer, so it is more prone to fine surface scratches and can be dulled by abrasive cleaners — always use a non-abrasive cleaner and a soft cloth. It can also flex slightly underfoot if a tub is under-supported, though quality tubs are engineered against this. The compensating advantage is that acrylic is very repairable: scratches can often be buffed out, and cracks or gouges filled and polished with an acrylic repair kit, frequently to a near-invisible result because the colour runs through the material rather than sitting only on the surface. Acrylic also will not rust or chip to bare metal. In short, cast iron resists damage but is hard to fix; acrylic accepts minor damage but is easy to restore.
Cost and value
Price often makes the final call. As a general guide for 2026, quality acrylic freestanding tubs from makers like Maax tend to land in the roughly $1,200 to $3,500 CAD range, with feature-rich or larger models higher. Cast iron tubs from a brand such as Cheviot typically start higher and climb faster — often in the $2,500 to $6,000+ CAD range — because of the material, the labour-intensive casting and enamelling, and the shipping weight. Those figures are ranges as of 2026 and move with size, finish, and feet or hardware options; treat them as planning brackets rather than quotes.
Don't forget the installation side of the budget. Cast iron's weight can add delivery and handling costs, may require framing reinforcement, and usually needs more hands on site. Acrylic's light weight keeps those costs down. Over a very long horizon cast iron's longevity can justify the premium, but for many renovations acrylic delivers the look and comfort clients want at a materially lower total cost.
Cast iron vs acrylic bathtub: side-by-side comparison
| Factor | Cast Iron (e.g. Cheviot) | Acrylic (e.g. Maax) |
| Empty weight | 300-500 lbs (136-227 kg) | 60-120 lbs (27-54 kg) |
| Subfloor load | Often needs framing check on upper floors | Rarely a structural concern |
| Initial feel | Cool to touch until warmed | Warm immediately |
| Heat retention | Excellent once warmed (high thermal mass) | Good; better with insulation/heater |
| Surface hardness | Very hard, scratch-resistant enamel | Softer; avoid abrasive cleaners |
| Main weakness | Can chip to bare iron (may rust) | Can scratch or dull over time |
| Repairability | Harder to fix invisibly | Scratches and chips often buffed/filled out |
| Lifespan | Generations with care | Long, though typically shorter than iron |
| Typical price (2026) | ~$2,500-$6,000+ CAD | ~$1,200-$3,500 CAD |
Which should you choose?
Choose cast iron if you want an heirloom-quality tub with a supremely stable, warm soak, you love the classic enamel look, you are installing on a ground floor or confirmed-strong framing, and the higher budget and handling are acceptable. Choose acrylic if you are renovating an upper floor or condo, want a warm-to-the-touch surface and a wider range of shapes, value easy repairs and lighter installation, or are working to a tighter budget. For a large share of GTA bathrooms — especially second-floor primary baths — acrylic is the pragmatic winner; for a statement soaker in a solid older home, cast iron rewards the investment.
Whichever way you lean, the right tub is the one matched to your floor, your soak habits, and your budget. Browse our full range of Bathtubs to compare materials side by side, or head straight to our Freestanding Bathtubs if a sculptural centrepiece is the goal — and reach out to our Concord showroom team any time you want a second opinion on weight, warmth, or fit.