Grainfather GCA Glycol Chiller Adapter Kit — Universal Fermenter Temperature Control for GC2 & GC4

The Grainfather GCA Glycol Chiller Adapter Kit is a compact, WiFi-connected temperature control solution that brings the precision of Grainfather glycol cooling to virtually any fermenter in your brewery — plastic buckets, stainless steel vessels, barrels, and conicals alike. Designed to bridge the gap between the Grainfather GC2 and GC4 Glycol Chillers and the wide range of fermenters that brewers actually own, the GCA makes accurate, app-controlled fermentation temperature management accessible without requiring a dedicated Grainfather conical fermenter or a full system upgrade.

What sets the GCA apart from basic temperature controllers and DIY glycol setups is its combination of active cooling, active heating, wireless connectivity, and a complete installation kit in a single, purpose-engineered package. The 304 stainless steel immersion cooling coil drops directly into the fermenter and circulates chilled glycol from the connected GC2 or GC4 to bring and hold fermentation temperature precisely at target — even in warm ambient conditions where passive cooling is insufficient. The included 30W heating pad works in tandem with the cooling coil, allowing the GCA to both raise and lower fermenter temperature as needed — a critical capability for step mashing protocols, diacetyl rests, and temperature-stepped fermentation schedules that require the fermenter to move up as well as down. The compact GCA unit with its colour display screen handles all switching and control logic, while WiFi connectivity and full Grainfather app integration let you monitor and adjust fermentation temperature remotely from anywhere — no standing over the fermenter, no manual adjustments in a cold cellar at midnight.

Everything needed for a complete installation arrives in the box — GCA unit, heating pad, 304 stainless steel cooling coil, rubber bung, temperature probe, 2×2m insulated hoses, hose clamps, and rubber bung stoppers — so the only additional requirement is a connected GC2 or GC4 glycol chiller and a fermenter to connect it to. Backed by Grainfather's 3-year warranty, the GCA is a long-term investment in fermentation control that works across your entire fermenter fleet, not just a single vessel.

GCA Glycol Chiller Adapter Kit — complete installation contents GCA unit (101×63mm, 12V, colour display, WiFi). Heating pad (80×220mm, 30W, 2m cable). 304 stainless steel cooling coil (520×119mm). Temperature probe (2m). 2×2m insulated hoses. 2× hose clamps. Rubber bung. 4× rubber bung stoppers. GC2 or GC4 glycol chiller and fermenter sold separately.

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Key Features

• Universal fermenter compatibility — plastic, stainless steel, bucket, barrel, and conical fermenters
• 304 stainless steel immersion cooling coil — food-grade, precise glycol heat exchange
• Active heating and cooling — 30W heating pad and glycol cooling coil in one system
• WiFi connectivity — full Grainfather app control and monitoring from anywhere
• Compact colour display screen — current and target temperature at a glance on the unit
• Complete installation kit — all hoses, clamps, bungs, probe, and fittings included
• 3-year warranty — long-term investment backed by Grainfather quality assurance

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Usage

Best suited for: Precision fermentation temperature control across a wide range of fermenter types, temperature-stepped fermentation profiles, diacetyl rests, lager fermentation, Kveik and high-temperature ale control

Compatible with: Grainfather GC2 and GC4 Glycol Chillers, plastic fermentation buckets, stainless steel fermenters, barrels, conical fermenters — Grainfather app (iOS & Android)

Note: GC2 or GC4 Glycol Chiller and fermenter are not included and must be purchased separately.

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Quick facts

Brand: Grainfather Type: Glycol chiller adapter kit Cooling: 304 stainless steel immersion coil — GC2/GC4 glycol Heating: 30W heating pad GCA unit: 101×63mm, 12V, colour display Connectivity: WiFi — Grainfather app (iOS & Android) Cable lengths: GCA 2m, heating pad 2m, temperature probe 2m Warranty: 3 years Use: Universal fermenter temperature control, glycol cooling integration