Choosing between Acrylic Tub and Cast-Iron Tub is one of the most common decisions homeowners face when planning a bathroom fixtures project in Brevard County. Both have earned strong reputations, but they serve different priorities - and in Florida's climate, the wrong choice can mean premature wear, finish failure, or performance issues that would not surface in milder environments.
This comparison breaks down the real differences between Acrylic Tub and Cast-Iron Tub based on construction quality, pricing, style options, and - critically - how each performs in the heat, humidity, and salt air conditions that define the Space Coast. If you already know what you want and need a project estimate, our free estimate tool gives you a realistic range in minutes, and our bathroom remodeling page shows how we run a tub replacement.
Acrylic Tub vs Cast-Iron Tub: Side-by-Side Comparison
| Factor | Acrylic Tub | Cast-Iron Tub |
|---|---|---|
| Weight (60 x 30 in, empty) | 58 to 71 lb (Kohler Archer and Underscore) | 310 to 316 lb (Kohler Bellwether and Villager) |
| Heat Retention | Shell feels warm right away | Heavy mass holds heat once warmed |
| Durability | Can scratch but is repairable | Extremely durable, chips are hard to fix |
| Install effort | Two people can carry it | Needs a crew or dolly, harder on stairs |
| Feel | Warm to touch, lightweight feel | Solid, substantial premium feel |
How much does a cast iron tub weigh compared to an acrylic tub?
A standard 60 x 30 inch enameled cast iron tub weighs roughly four to five times as much as an acrylic tub of the same footprint. The numbers below come straight from Kohler's published specification sheets. We added the weight of the water at full capacity (water weighs about 62.4 lb per cubic foot, or about 8.34 lb per gallon, per the USGS) so you can see the total load before anyone steps in.
| Kohler model (60 in) | Material | Empty weight | Water capacity | Tub plus water | Kohler minimum floor load |
|---|---|---|---|---|---|
| Villager K-715 | Enameled cast iron | 316 lb | 33 gal | about 591 lb | 49 lb/sq ft |
| Bellwether K-837 | Enameled cast iron | 310 lb | 32.6 gal | about 582 lb | 52 lb/sq ft |
| Underscore K-1121 | Acrylic | 71 lb | 59.8 gal | about 570 lb | 50 lb/sq ft |
| Archer K-1946 | Acrylic | 58 lb | 57 gal | about 533 lb | 45 lb/sq ft |
The surprise in the data: a deep acrylic soaker holds almost twice the water of a classic cast iron alcove tub, so once both are full the total load is in the same range. The real difference is the dead weight you have to carry into the house and set, and the load that sits on the floor every day when the tub is empty.
Can a second floor support a cast iron tub?
Often yes, but it needs a framing check first. The International Residential Code (Table R301.5) designs living areas for a 40 lb per square foot live load and sleeping areas for 30. Every Kohler tub in the table above lists a minimum floor load of 45 to 52 lb per square foot, which is higher than that baseline, so any full tub on an upper floor deserves a look at joist size, span and spacing. A ground-floor concrete slab carries either tub without changes. On a second-floor Brevard County bath we confirm the framing before we order a cast iron tub, and if the joists need help we price the blocking or sistering into the bid instead of discovering it after demolition.
Do acrylic tubs feel cheap?
A well-installed acrylic tub should not. Acrylic feels lighter and warmer to the touch than cast iron, and that is the difference most people notice. The hollow or flexing feel that gives acrylic a cheap reputation usually comes from a tub that is not fully supported underneath. Setting the tub on the support the manufacturer's installation instructions call for is what makes it feel solid. Cast iron simply cannot flex, which is a big part of why people describe it as feeling substantial.
Does cast iron keep bath water hotter than acrylic?
Cast iron has far more mass, so once it is warm it gives heat back to the water slowly. The catch is that a cold cast iron tub first pulls heat out of the water to warm itself, which is why many owners run the hot tap for a minute before filling. Acrylic is a thin shell that feels warm almost immediately and does not steal much heat at the start. Neither material changes how fast the water surface loses heat to the room, so for long soaks the bigger factors are water depth and bathroom temperature.
Florida Climate Considerations
Humidity is not a deciding factor between these two. Both have nonporous finishes that do not absorb moisture. What matters in a Florida bath is ventilation and the floor the tub sits on. Cast iron tub weight is the serious consideration on second floors and in older homes, so verify floor joist capacity before specifying a tub over 300 lb for an upper-level Brevard County bathroom.
Our Verdict
Acrylic is the practical choice for most Florida bathrooms due to lighter weight and lower cost. Cast-iron is the premium heirloom option for luxury master bathrooms with adequate floor support.
Which Should You Choose for Your Brevard County Home?
Pick acrylic for a second-floor bath, a deep soaking tub, a tight budget, or a remodel where the tub has to come up a staircase. Pick enameled cast iron for a ground-floor primary bath where you want a rigid, glossy, heirloom tub and the extra install effort is acceptable. Either way, confirm the floor framing first and order a model whose spec sheet you have read.
For a personalized recommendation based on your home, budget, and design goals, schedule a consultation with our ELSO bathroom fixtures team. We can show you samples of both products and help you understand which is the better fit for your specific project in Brevard County.
Frequently Asked Questions
How much does a cast iron bathtub weigh?
A standard 60 x 30 inch enameled cast iron alcove tub weighs about 310 to 316 lb empty, based on Kohler's Bellwether K-837 and Villager K-715 spec sheets. Filled to capacity with about 33 gallons of water it carries roughly 580 to 590 lb before a person gets in. A 60 x 30 inch acrylic tub from the same maker weighs 58 to 71 lb empty.
Can my Florida floor support a cast-iron tub?
A ground-floor concrete slab handles any residential tub. Upper floors need a framing check. The residential code designs living areas for 40 lb per square foot, while Kohler lists a minimum floor load of 49 to 52 lb per square foot for its 60 inch cast iron tubs. A contractor or engineer should confirm joist size, span and spacing before a cast iron tub goes on a second floor.
Do acrylic tubs feel cheap?
Not when they are installed correctly. Acrylic is lighter and warmer to the touch than cast iron, but the flexing or hollow feel people complain about usually means the tub was not fully supported underneath. Following the manufacturer's installation instructions for floor support makes an acrylic tub feel solid. Cast iron cannot flex at all, which is why it feels more substantial.
Which holds bath water hotter longer?
Cast iron holds heat better once it is warm because of its mass, but a cold cast iron tub first draws heat out of the bath water. Running hot water through it for a minute before filling helps. Acrylic feels warm right away and takes less heat from the water at the start. For long soaks, water depth and room temperature matter as much as the tub material.
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- Single vs Double Vanity (2026 Comparison)
Sources
- Kohler Villager K-715 specification sheet
- Kohler Underscore K-1121 specification sheet
- 2021 IRC Table R301.5, minimum live loads
- USGS Water Science School, water density
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