What Are Bathtubs Made Of? | Types, Pros & Best Materials for 2025

Choosing the right bathtub material affects more than just aesthetics. It impacts how warm your bath stays, how easy the surface is to clean, how long the tub lasts, and how much it costs to install or replace. So, what are bathtubs made of in 2025?

From lightweight acrylic to luxurious stone resin, each material comes with its own benefits and tradeoffs. This guide helps homeowners and remodelers understand today’s most popular bathroom tub materials, how to compare them, and how to identify what type of tub you already have at home.

Whether you're replacing an old unit or upgrading to a spa-like model, understanding the types of bathtub materials available will help you make a confident, well-informed decision.

Before diving into the individual types, here’s a side-by-side preview of the most common bathtub materials in use today.

These materials differ significantly in installation complexity, daily use, longevity, and price, making the selection process more than just a design choice.

The Most Popular Bathtub Materials in 2025

Choosing the right bathtub material is crucial not just for comfort and aesthetics, but also for durability, heat retention, and maintenance. Here’s a breakdown of the most popular bathtub materials homeowners are turning to in 2025, including pros, cons, and who each type is best for.

Acrylic Bathtubs

Acrylic bathtubs continue to dominate in 2025 thanks to their versatility, cost-effectiveness, and ease of maintenance. They're a favorite among homeowners and contractors alike for both renovations and new installations.

What Is Acrylic Bathtubs

Acrylic bathtubs are formed by heating sheets of acrylic, then molding and reinforcing them with fiberglass. They are among the most common mid-range tub materials used in both renovations and new builds.

Pros:

• Non-porous and resists mildew and stains
• Excellent heat retention — water stays warmer longer
• Lightweight for easier installation
• Available in many shapes, sizes, and finishes
• Surface is repairable if scratched

Cons:

• Can scratch if cleaned with abrasive tools
• Flexes slightly under pressure (less sturdy than cast iron)
• Poorer-quality acrylic may yellow over time

Read Also: Why choose acryli bathtubs

Best For:
Homeowners seeking an affordable, lightweight, and stylish tub with good insulation and minimal upkeep.

Cast Iron Bathtubs

If you’re looking for timeless beauty and unmatched longevity, cast iron bathtubs are still a top-tier choice in 2025. Though heavy, their durability and elegance make them a premium option.

What It Is:

Made by pouring molten iron into a mold and coating it with porcelain enamel, cast iron tubs are known for their vintage charm and longevity.

Pros:

• Extremely durable — can last 70+ years
• High heat retention
• Resistant to chipping and scratches
• Easy to clean and refinished if needed

Cons:

• Very heavy — requires structural floor support
• Expensive installation and transport costs
• Limited design flexibility compared to acrylic

Best For: Ground-floor installations, luxury bathrooms, and homeowners who value timeless design and long-term durability.

Fiberglass (FRP) Bathtubs

Perfect for quick upgrades or rental properties, fiberglass bathtubs offer a highly affordable entry point into full-sized soaking bathtubs . While they may not last as long as premium materials, they serve their purpose well in low-traffic bathrooms.

What It Is:

Fiberglass tubs are formed from layers of plastic reinforced with woven glass fibers and coated in a resin gelcoat. This is one of the most budget-friendly bath materials available.

Pros:

• Very affordable
• Lightweight and easy to install
• Surface can be repaired with kits
• Common in rental or secondary bathrooms

Cons:

• Prone to scratches, cracks, and fading
• Porous — absorbs water and stains more easily
• Less durable than acrylic or cast iron

Best For: Budget-friendly renovations, secondary bathrooms, and low-use spaces.

Porcelain-Enameled Steel Bathtubs

Porcelain-enameled steel tubs combine classic looks with a lighter and more affordable design compared to cast iron. They’re often a middle-ground option for homeowners looking for style without the high price.

What It Is:

A sheet of stamped steel coated in porcelain enamel. These tubs mimic the look of cast iron but are lighter and more affordable.

Pros:

• Smooth, glossy surface that’s easy to clean
• Stable feel underfoot
• Durable and chip-resistant (to a degree)
• Lower cost than cast iron

Cons:

• Low heat retention — water cools faster
• Surface may chip and expose steel to rust
• Heavy (but not as heavy as cast iron)

Best For: Cost-conscious homeowners who want a traditional look without the bulk of cast iron.

Stone Resin (Solid Surface) Bathtubs

A growing favorite for luxury bathrooms, stone resin tubs strike a balance between natural aesthetics and modern performance. These tubs are especially popular among homeowners looking for clean, architectural lines and spa-like comfort.

What It Is:

Engineered from crushed stone and resin, stone resin tubs offer a sleek look with natural warmth and durability. Aquatica’s proprietary AquateX™ is an example of high-performance stone resin.

Pros:

• Non-porous and stain-resistant
• Excellent heat retention
• Durable, scratch-resistant surface
• Eco-friendly and recyclable
• Matte and glossy finish options

Cons:

• Heavier than acrylic
• Mid-to-high price point

Best For: Modern bathrooms seeking a minimalist luxury aesthetic with long-lasting performance.

Cultured Marble / Cast Polymer

Cultured marble tubs are ideal for those who love the look of natural stone but want a more affordable, customizable, and lightweight alternative. They're especially useful in bespoke bathroom designs.

What It Is:

A mix of crushed stone (like limestone) and resin, molded and topped with a gelcoat. It mimics the look of marble at a lower price point.

Pros:

• Elegant appearance with veining and smooth finishes
• Heat retention is decent
• Available in custom colors and shapes
• Surface can be refinished if scratched

Cons:

• Can discolor or stain if not cleaned properly
• Requires gentle cleaners — avoid harsh abrasives
• Heavier than acrylic

Best For: Luxury-style bathrooms on a moderate budget.

Ceramic Bathtubs

Ceramic bathtubs are a nod to traditional craftsmanship and vintage charm. While not as common in modern homes, they remain a beautiful option for those creating artistic or Mediterranean-style bathrooms.

What It Is:

Made by assembling ceramic tiles or creating a full ceramic shell. Traditional and often seen in custom bathroom designs.

Pros:

• Customizable with a variety of finishes and patterns
• Affordable entry cost
• Heat-resistant surface

Cons:

• Requires grout maintenance
• Can feel uneven or cold to the touch
• Cracks may occur with impact

Best For: Classic or decorative bathrooms where visual design matters more than long-term durability.

Copper & Wood Bathtubs

Reserved for luxury bathroom settings, copper and wood bathtubs are less about mass appeal and more about making a bold, design-focused statement. Each tub is unique, handcrafted, and built for those who value form as much as function.

What They Are:

Copper tubs are hand-crafted from metal sheets and naturally develop a patina over time. Wood tubs are custom-built from hardwoods like teak or hinoki and sealed with waterproof coatings.

Copper Pros:

• Naturally antimicrobial
• High heat retention
• Unique, artisanal appearance
• Low-maintenance surface

Wood Pros:

• Organic, spa-like look
• Custom sizes and shapes are available
• Warm, comfortable surface feel

Copper & Wood Cons:

• Both are very expensive
• Require structural floor reinforcement
• Wood demands intensive care and sealing

Best For: High-end, design-forward bathrooms prioritizing uniqueness and luxury.

Pros and Cons of Bathtub Materials

Use this detailed comparison table to evaluate the bathtub materials pros and cons at a glance. It includes key considerations like heat retention, durability, cost, and ideal use cases—helping you choose the right tub for your needs.

This table serves as a quick visual aid for evaluating the best bathtub materials for your bathroom based on use case, style, and long-term performance.

How to Choose the Best Bathtub Material for Your Bathroom

Every bathroom project has different goals—whether it’s creating a daily-use family tub or designing a spa-like master retreat. The right bathtub material depends on more than looks. Below are key considerations to guide your decision.

Evaluate Your Budget

Material costs vary significantly. For example:

• Fiberglass: Budget-friendly ($300–$800)
• Acrylic bathtubs : Affordable mid-range ($400–$1,500)
• Stone Resin & Cast Iron: Premium range ($1,800–$8,000+)

Tip: Factor in not only the tub’s purchase price, but also installation, delivery, and potential floor reinforcement—especially for heavier materials like cast iron or stone.

Consider Installation Weight & Structural Support

Weight is a critical factor—especially in upper-floor bathrooms.

Lightweight materials simplify logistics. Heavier tubs may demand construction adjustments and added labor.

Heat Retention and Comfort

Materials like cast iron, stone resin, and copper are top-tier in holding warmth, ideal for long soaks. In contrast, fiberglass and steel lose heat more quickly.

If thermal comfort is a priority, look for:

• Insulated bathtub designs
• Integrated heated bath tub or heated soaking bathtubs options (e.g., Aquatica’s Tranquility System)

Durability and Maintenance Needs

If your tub will see frequent use—especially in households with kids or pets—choose a durable, scratch-resistant material like cast iron or stone resin.

Low-maintenance options:

• Stone Resin (non-porous, resists stains)
• Porcelain-Coated Steel
• Acrylic bathtubs (easy to clean, mildew-resistant)

High-maintenance options:

• Wood (requires frequent sealing)
• Ceramic (grout maintenance)

Bathroom Style & Design Match

Each material delivers a different aesthetic:

• Stone resin: Sleek, matte or satin finishes—ideal for modern bathrooms
• Cast iron: Vintage charm—pairs well with clawfoot and pedestal styles
• Copper or wood: Unique spa-inspired or rustic themes
• Acrylic: Versatile—available in many styles, colors, and configurations

You may also want to coordinate with tub accessories, wall surrounds, or matching vanities.

Heated Bathtubs & Soaking Options

Looking to enjoy longer, warmer baths without constantly topping up hot water? Heated bathtubs and high heat-retention materials can make a major difference. Whether you're aiming for spa-level relaxation or simply better efficiency, this section explores why heated tubs matter, which materials hold warmth best, and top product recommendations that combine comfort with modern design.

Why Heated Bathtubs Matter

For homeowners who enjoy long, relaxing baths, heat retention is a major factor when selecting a bathtub material. Traditional tubs often lose warmth within 20–30 minutes. In contrast, insulated bathtubs and built-in heated soaking bathtubs help maintain water temperature for extended periods—without constantly adding hot water.

This not only enhances comfort but also saves on water and energy bills.

Materials That Retain Heat Best

• Stone Resin: Naturally warm to the touch, retains heat efficiently
• Cast Iron: Known for holding heat for long soaks
• Copper: Excellent thermal conductor and retains heat effectively
• Acrylic: Holds heat better than steel or fiberglass, especially in double-walled models

Aquatica’s Tranquility Heating System

Aquatica’s Tranquility System offers a built-in hot tub–style water heating system designed to keep water at a constant temperature. It integrates directly into select stone resin and acrylic tubs, providing a continuous, spa-quality soak, without noisy jets or frequent refilling.

Features:

• Whisper-quiet operation
• Thermostatic temperature control
• Compatible with Freestanding Bathtubs
• Ideal for those seeking the best heated bathtub experience

Best Heated Soaking Tubs from Aquatica

Recommended Models with Heating Options:

• Aquatica True Ofuro (stone resin, Tranquility-ready)
• Aquatica Purescape™ 327B (compact acrylic tub with heat retention)
• Aquatica Karolina 2 ( Freestanding Bathtubs , double-wall insulation)

These models offer premium soaking experiences with modern design and thermal comfort—perfect for year-round use.

Acrylic Soaking Tub vs Cast Iron – Which Is Better?

When comparing acrylic soaking bathtubs vs cast iron bathtubs, homeowners typically weigh factors like heat retention, weight, maintenance, and budget. Both materials are popular for different reasons—but they suit different needs.

Heat Retention

• Cast Iron: Retains heat better than any other bathtub material. Water stays warm for extended periods.
• Acrylic: Offers good heat retention—especially for double-walled tubs—but not as long-lasting as cast iron.

Winner: Cast iron (for longer soaks)

Durability & Lifespan

• Cast Iron: Extremely durable. Resists scratches, dents, and chips. Can last 50–70+ years with proper care.
• Acrylic: Durable but more prone to surface scratches and flexing under weight. Typically lasts 10–15 years.

Winner: Cast iron (for long-term durability)

Installation & Weight

• Cast Iron: Very heavy (up to 500 lbs). May require floor reinforcement and professional installation.
• Acrylic: Lightweight and much easier to transport and install, even in upper-floor bathrooms.

Winner: Acrylic (for convenience and remodeling ease)

Maintenance & Cleaning

• Cast Iron: Enamel coating resists stains and cleans easily with non-abrasive cleaners.
• Acrylic: Also non-porous and mildew-resistant, but requires gentle cleaning to avoid scratches.

Winner: Tie — both are low-maintenance with proper care.

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