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% matchfills 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% matchfills 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 matchComes 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 matchComes 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 matchComes 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 matchComes 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 matchComes 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 matchComes 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% matchInto 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% matchInto 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% matchsits 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% matchshapes 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% matchsits 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% matchsits 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 matchComes 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 matchComes 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
Benson Amps Portable Distortion 424 MKII
Benson Amps
54% similarityShared character: boost, subtle, distortion
Xotic RC Booster
Xotic
54% similarityShared character: boost, touch, transparent
Crowther Hot Cake
Crowther
53% similarityShared character: boost, subtle, transparent
Dr. Scientist Sunny Day
Dr Scientist
53% similarityShared character: boost, transparent
MXR MC401 Boost/Line Driver
MXR
53% similarityShared character: boost, touch, transparent
Xotic BB Preamp V1.5
Xotic
52% similarityShared character: boost, lead
Boutique & premium upgrades
Similar charactersee all similar tone character →
Digitech DOD 410 Bifet Boost
Digitech
58% similarityShared character: boost, transparent
Klon KTR
Klon
57% similarityShared character: boost, touch, transparent
Matthews Effects Aristocrat MOSFET Boost
Matthews Effects
56% similarityShared character: boost, transparent, distortion
K Pedals Vintage Preamp
K Pedals
54% similarityShared character: boost, subtle, distortion
Wadsworth Music Engager Boost
Wadsworth Music
54% similarityShared character: boost, transparent, lead
Hudson Electronics Dual Broadcast
Hudson Electronics
53% similarityShared character: boost, touch, transparent
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).