The ThorpyFX Heavy Water Dual Boost is a ThorpyFX boost pedal, currently around $239.82. Close alternatives include the Digitech DOD 410 Bifet Boost and the Klon KTR. It pairs well with the Marshall JCM900 2100 and the Orange Rockerverb 50 MkIII 2-Channel 50W Head.

ThorpyFX Heavy Water Dual Boost

ThorpyFX · pedal

The ThorpyFX Heavy Water is a dual high-headroom boost, built after requests to release the boost side of the Dane as a standalone pedal. The right-hand side is that Dane-derived clean boost, with Output and Lows controls that thin the signal out or fatten it up while otherwise leaving the amp's character alone -- at modest settings a subtle always-on lift that simply makes an amp sound better. The left side shares the same controls but clips through germanium diodes for a grittier, warmer, more textured boost with a touch of natural compression. Each half works independently, and stacking both will smash the front end of a valve amp into full overdriven submission. Reviewers rate it among the most versatile boosts available, running from transparent tone enhancement to an outright lead screamfest, in ThorpyFX's exemplary aircraft-aluminium build.

What stands out

  • “The ThorpyFX Heavy Water is a dual high-headroom boost, built after requests to release the boost side of the Dane as a standalone pedal”

    — from the listing

  • “Build quality is exceptional”

    — from the community notes

  • “The right-hand side is that Dane-derived clean boost, with Output and Lows controls that thin the signal out or fatten it up while otherwise leaving the amp's character alone -- at modest settings a subtle always-on lift that simply makes a…”

    — from the listing

  • “Each half works independently, and stacking both will smash the front end of a valve amp into full overdriven submission”

    — from the listing

  • “Reviewers rate it among the most versatile boosts available, running from transparent tone enhancement to an outright lead screamfest, in ThorpyFX's exemplary aircraft-aluminium build”

    — from the listing

Trade-offs

  • “The Heavy Water delivers rich, harmonically complex distortion in ThorpyFX's exceptional hand-built quality”

    — from the reviews

  • “heavy distortion character suits hard rock and heavy applications”

    — from the reviews

  • boost
  • clean boost
  • high headroom
  • natural compression
  • harmonically complex
  • boutique
  • germanium

Price updated Oct 25, 2026

Genres the ThorpyFX Heavy Water Dual Boost is commonly used in

Amps that pair well with the ThorpyFX Heavy Water Dual Boost

Marshall JCM900 2100

Marshall

22% match
$799.95via Reverb

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (transparent → mid-forward)

Into a transparent tone, Marshall JCM900 2100 brings a pull toward mid-forward that's missing

Comes later in the signal chain

Orange Rockerverb 50 MkIII 2-Channel 50W Head

Orange

22% match

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (transparent → mid-forward)

Orange Rockerverb 50 MkIII 2-Channel 50W Head leans this transparent tone toward mid-forward, which it doesn't make on its own

Comes later in the signal chain

Ceriatone 2202H

Ceriatone

tonal match

Comes later in the signal chain

Ceriatone 2202H leans this transparent tone toward high gain, which it doesn't make on its own

Synergy SL2 Module

Synergy

tonal match

Comes later in the signal chain

Synergy SL2 Module leans this transparent tone toward high gain, which it doesn't make on its own

ENGL Special Edition E670

Engl

tonal match

Comes later in the signal chain

Into a transparent tone, ENGL Special Edition E670 brings a pull toward high gain that's missing

Friedman Small Box 50W EL34 Amp Head

Friedman

tonal match

Comes later in the signal chain

Into a transparent tone, Friedman Small Box 50W EL34 Amp Head brings a pull toward high gain that's missing

Mesa/Boogie JP-2C John Petrucci Signature 60/100-Watt

Mesa Boogie

tonal match

Comes later in the signal chain

Into a transparent tone, Mesa/Boogie JP-2C John Petrucci Signature 60/100-Watt brings a pull toward high gain that's missing

Orange Rockerverb 50 MkIII NEO 50W 2x12 Combo

Orange

tonal match

Comes later in the signal chain

Into a transparent tone, Orange Rockerverb 50 MkIII NEO 50W 2x12 Combo brings a pull toward high gain that's missing

Pedals that stack with the ThorpyFX Heavy Water Dual Boost

Dr. Scientist Frazz Dazzler

Dr Scientist

21% match
$204.36via Reverb

Into a transparent tone, Dr. Scientist Frazz Dazzler brings a pull toward low gain that's missing

Comes later in the signal chain

EarthQuaker Devices Hizumitas

EarthQuaker Devices

21% match

Into a transparent tone, EarthQuaker Devices Hizumitas brings a pull toward high gain that's missing

Comes later in the signal chain

Boss BF-2 Flanger

Boss

14% match
$100via Reverb

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Put Boss BF-2 Flanger after ThorpyFX Heavy Water Dual Boost in the signal chain, clear of ThorpyFX Heavy Water Dual Boost's own gain stage

Comes later in the signal chain

Wampler Mini Ego 76 Compressor

Wampler

13% match
$178.90via Reverb

shapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain.

Wampler Mini Ego 76 Compressor's own compressed character is the real reason this is worth trying

Comes earlier in the signal chain

Binson Echorec Delay

Binson

8% match

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Run Binson Echorec Delay after ThorpyFX Heavy Water Dual Boost in the signal chain, clear of ThorpyFX Heavy Water Dual Boost's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

Boss RV-5 Digital Reverb

pedal

8% match
$81.48via Reverb

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Boss RV-5 Digital Reverb's spring voice goes after ThorpyFX Heavy Water Dual Boost in the signal chain — it's not there to compete with ThorpyFX Heavy Water Dual Boost's own clean boost character — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

Dr. Scientist Frazz Dazzler V2

Dr Scientist

tonal match
$204.36via Reverb

Comes later in the signal chain

Dr. Scientist Frazz Dazzler V2 leans this transparent tone toward fuzzy, which it doesn't make on its own

Donner Big Mouth Distortion

Donner

tonal match
$29.95via Reverb

Comes later in the signal chain

Donner Big Mouth Distortion leans this transparent tone toward high gain, which it doesn't make on its own

Cheaper alternatives

Boutique & premium upgrades

Similar charactersee all similar tone character →

See all alternatives to the ThorpyFX Heavy Water Dual Boost (cheaper + boutique) →

Questions people ask

What are good alternatives to the ThorpyFX Heavy Water Dual Boost?+

The closest matches in character are the Digitech DOD 410 Bifet Boost, the Klon KTR, the Matthews Effects Aristocrat MOSFET Boost. Budget picks: Benson Amps Portable Distortion 424 MKII, Xotic RC Booster, Crowther Hot Cake. Boutique upgrades: ThorpyFX Electric Lightning.

What pairs well with the ThorpyFX Heavy Water Dual Boost?+

Strong matches from rig and tone-complementarity evidence: Marshall JCM900 2100, Orange Rockerverb 50 MkIII 2-Channel 50W Head, Ceriatone 2202H — Into a transparent tone, Marshall JCM900 2100 brings a pull toward mid-forward that's missing.

How much does the ThorpyFX Heavy Water Dual Boost cost?+

Around $239.82 (live listing price, updated Oct 25, 2026).

Compare

Related searches