---
title: "Bathtub vs radiator — size, weight and speed compared"
description: "Bathtub is 1.5× radiator on weight. Compared on 4 measured properties, with the full range and a source for each."
url: https://atoneplace.net/vs/bathtub-vs-radiator/
site: "At One Place"
---

# Bathtub vs Radiator

**Bathtub vs radiator: Bathtub is larger on weight**

Bathtub is 1.5× radiator on weight.

A bathtub and a radiator can be compared on 4 measures. The figures below are typical adult or full-size values, with the larger of the two in bold.

## Side by side

*Larger value in bold. Ranges reflect genuine variation, not uncertainty.*

|  | Bathtub | Radiator |
| --- | --- | --- |
| Weight | 18–180 kg | 10–100 kg |
| Width | 70–90 cm | 40–200 cm |
| Typical lifespan | 15–50 yr | 15–100 yr |
| Typical cost | 200–4,000 $ | 70–1,200 $ |

## What the numbers say

- Bathtub is 1.5× radiator on weight.
- Radiator is somewhat greater than bathtub on width — about 1.3×.
- Bathtub and radiator are near enough identical on typical lifespan.
- Bathtub is 2.7× radiator on typical cost.

*Weight compared.*

- Bathtub: 18–180 kg
- Radiator: 10–100 kg

## Bathtub

A plumbed tub for bathing, most often a 1,525 mm acrylic alcove bath.

## Radiator

A wall-mounted heat emitter fed with hot water from a boiler, transferring heat mostly by convection.

> This is a comparison of published measurements, nothing more. It describes how two things differ on measures that have been recorded; it does not predict how they would fare against each other in any situation.

## Common questions

### Which is bigger, bathtub or radiator?

Bathtub is 1.5× radiator on weight. Both figures are typical values; the full range for each is in the table above.

### How do bathtubs and radiators compare on width?

Bathtub: 70–90 cm. Radiator: 40–200 cm. Radiator is somewhat greater than bathtub on width — about 1.3×.

### How do bathtubs and radiators compare on typical lifespan?

Bathtub: 15–50 yr. Radiator: 15–100 yr. Bathtub and radiator are near enough identical on typical lifespan.

## Related pages

- [Bathtub vs toilet](https://atoneplace.net/vs/bathtub-vs-toilet/)
- [Radiator vs toilet](https://atoneplace.net/vs/radiator-vs-toilet/)
- [Bathtub vs front door](https://atoneplace.net/vs/bathtub-vs-front-door/)
- [Kitchen sink vs radiator](https://atoneplace.net/vs/kitchen-sink-vs-radiator/)

## Sources

- Typical range compiled from manufacturer specifications — At One Place (/about/)