Reinforced internal frame
The internal structure that supports a HERA acrylic bathtub, giving it rigidity and its load rating. You never see it, but it is doing the work every time the tub is filled.
What it means
An acrylic bathtub shell is light, warm to the touch, and easy to move, but on its own it would flex under the weight of a full bath. The reinforced internal frame is the skeleton built inside and underneath that shell. It stiffens the walls and base, keeps the tub sitting level, and carries the weight of the water and the bather down into the floor.
The frame is why a lightweight freestanding bathtub can feel as solid as something far heavier. When you lean on the rim of a well-made acrylic tub and it does not give, that is the frame at work, not the acrylic itself.
It is also where a bathtub's load rating comes from. The rating on a spec sheet describes what the frame and shell together can safely support, which connects to the ideas of static load and live load that come up whenever people ask whether a bathtub is safe for their floor.
In a Singapore home
Every tub in the HERA bathtub range is made from premium acrylic with a reinforced internal frame. The combination is deliberate: acrylic keeps the empty weight down to just 30kg to 45kg, light enough to carry into an HDB or condo bathroom and install in about 30 to 45 minutes with no renovation, while the frame supplies the rigidity and gives each tub a static load rating of up to 300kg per manufacturer specification.
That rating matters in practice. A filled HERA bathtub with a bather comes to about 300kg, and because the frame spreads that weight across the full footprint of the tub rather than concentrating it on one point, it sits comfortably within the standard structural capacity of HDB and condo bathroom floors.
The frame is also treated as a core part of the product rather than an accessory: the 1-year HERA warranty against manufacturing faults explicitly covers the reinforced internal frame alongside the acrylic surface, the drainage components, and the included hardware.
Quick questions
What does the reinforced internal frame actually do?
It gives the acrylic shell its rigidity and carries the weight of the water and the bather down to the floor. Without it, a lightweight acrylic tub would flex under load; with it, the bathtub feels solid and earns its load rating.
How much weight can a HERA bathtub hold?
Each HERA bathtub is rated for a static load of up to 300kg per manufacturer specification. A filled tub with a bather comes to about 300kg in total, and that weight is spread across the full footprint of the bathtub rather than resting on a single point.
Is the internal frame covered by the warranty?
Yes. The 1-year HERA warranty against manufacturing faults covers the acrylic surface, the reinforced internal frame, the drainage components, and the included hardware. Registration is automatic with every purchase, so there is no form to fill in.
Does the frame make the bathtub heavy?
No. Even with the frame inside, a HERA bathtub weighs just 30kg to 45kg empty, depending on the size. That light empty weight is part of what makes no-renovation installation possible in HDB and condo bathrooms.
Related terms
Feel how solid a light tub can be
All 14 bathtub models are on display at the MacPherson showroom, so you can lean on a rim and feel the frame at work. Or message us on WhatsApp and the team will help you pick a size, usually within 15 minutes during showroom hours.