Water Heater Brand Comparisons for Van Builders

Brand comparisons are where a lot of builders land after they've decided on "electric storage boiler" as their category, and are just trying to figure out which specific unit to buy. Here's the honest, no-favorites-picked overview before you go deeper into a head-to-head.

Pundmann Therm 3L water heater
Pundmann's compact rectangular design, shown here in the 3L size.

Isotemp

Comes from a marine background and is built around using engine coolant to heat water while driving, with an electric element as backup. It's a proven, well-regarded design in boats and has carried over well to vans, but the units draw more power on electric mode (750–1200W) and tend to have a larger, more cylindrical footprint that doesn't always package as cleanly into van cabinetry.

Pundmann

A German manufacturer focused specifically on compact, rectangular electric boilers designed for tight mobile spaces, with lower-wattage elements (180–200W) that are friendlier to smaller battery banks, plus the option to tie into a diesel air heater for a third heat source.

Duoetto / Sandy Vans

A dual-voltage cylindrical tank aimed at the North American RV/van market, with straightforward install and solid brand recognition in that space, though like Isotemp, the cylindrical shape can cost you more cabinet depth than a rectangular alternative.

See the water heater lineup.

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