ThorpyFX Heavy Water review

It’s time to go nuclear with a double dose of boost…

ThorpyFX Heavy Water review
(Image: © Future / Olly Curtis)

Guitar World Verdict

The Heavy Water is one versatile dual boost. Use it to wallop the front end of your amp or as an always-on secret weapon, it's all gravy.


  • +

    Two boosts of different character.

  • +

    Practical EQ.

  • +

    Huge amount of boost available.

  • +

    Exemplary build quality.


  • -

    Nothing here, folks.

You can trust Guitar World Our expert reviewers spend hours testing and comparing guitar products so you can choose the best for you. Find out more about how we test.

ThorpyFX’s The Dane, a twin-footswich pedal featuring overdrive and boost, has many admirers but not all of them need a new overdrive

Consequently, after many requests to put just the boost side into a pedal in its own right, Thorpy has done just that. The result is the Heavy Water, which not only provides that exact same high-headroom clean boost but also pairs it with a second boost that features germanium diodes in its circuitry for a different character. 

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Trevor Curwen

Trevor Curwen has played guitar for several decades – he's also mimed it on the UK's Top of the Pops. Much of his working life, though, has been spent behind the mixing desk, during which time he has built up a solid collection of the guitars, amps and pedals needed to cover just about any studio session. He writes pedal reviews for Guitarist and has contributed to Total Guitar, MusicRadar and Future Music among others.