By the BrewUK Hub – Home Brewing Systems, Reviews & Guides for the UK Brewer Team · Updated May 2026 · Independent, reader-supported

Grainfather G30 vs Brewzilla 35L: Which All-in-One Brewing System Wins in the UK?

If you're considering stepping into all-in-one brewing systems, you've probably landed on these two. The Grainfather G30 and Brewzilla 35L are the market leaders in the UK, and choosing between them isn't straightforward—they each excel in different areas.

Price and Value

The Brewzilla 35L typically costs between £700 and £850, whilst the Grainfather G30 sits around £900 to £1,000. On paper, that makes the Brewzilla cheaper, but the real question is whether you're getting better value.

The Grainfather premium reflects its established market position and the companion app—a proper mobile experience that lets you monitor temperatures and step through your brew from your phone. The Brewzilla, meanwhile, offers more capacity for less money. If budget is your primary concern, the Brewzilla is the sensible choice. If you value connectivity and the refinement of an established ecosystem, the Grainfather justifies its price.

Capacity and Brew Size

Here's where they clearly differ. The Grainfather G30 tops out at 30-litre batches, whilst the Brewzilla reaches 35 litres. For most UK home brewers, this is academic—both handle traditional 20-litre brews with room to spare. But if you're thinking ahead to scaling up, or you want occasional flexibility with larger batches, the Brewzilla's extra capacity matters.

Heat Performance and Control

Both systems maintain temperature well, but they approach it differently. The Grainfather uses a 4.8kW element and heats water briskly, typically reaching 65°C in around 20 minutes from cold. The Brewzilla's 3.6kW element takes closer to 30 minutes for the same result—it's slower, but that's often a benefit if you're in an older UK property on a standard electrics supply. Some homes struggle with the Grainfather's peak draw.

For step mashing, both hold temperature accurately within ±1°C. The Grainfather's app gives you precise feedback throughout, while the Brewzilla relies on its built-in panel display and manual reading. Neither is objectively superior here—it depends whether you prefer digital confirmation or direct observation.

Connectivity and User Experience

The Grainfather app is intuitive and genuinely useful. You can programme recipes, receive alerts when temperature steps are reached, and monitor your brew remotely. It integrates with Brewers Friend for recipe management. For someone who enjoys the tech side of brewing, this is a genuine quality-of-life feature.

The Brewzilla has a WiFi-connected version (the iBrew), but it's a newer addition and less seamlessly integrated. The standard Brewzilla relies entirely on its control panel, which is clear and easy to use—just less convenient if you're moving between the brew room and indoors.

If you're interested in data logging and remote monitoring, the Grainfather wins. If you prefer simplicity and offline reliability, the Brewzilla is equally capable.

Build Quality and Longevity

Both are built solidly. The Grainfather uses stainless steel internally and has a reputation for reliability—it's been in the market longer, so you'll find plenty of secondhand units still running. The Brewzilla, being newer, has fewer long-term user stories, but early feedback suggests comparable durability.

The Grainfather's heating element and pump are slightly easier to access for maintenance, though you'll rarely need to touch them. The Brewzilla's design is equally robust, just with a tighter layout internally.

Cleaning and Maintenance

This is where frustrations emerge with both systems. The Grainfather's grain basket is simpler to remove and clean, and the recirculation path is more straightforward. The Brewzilla's grain basket requires a bit more disassembly, particularly if you're pushing large grain bills.

For both: you'll be running water through them after every brew, using either PBW or similar alkaline cleaner. Neither has a killer feature here. Plan on 20 minutes post-brew for proper cleaning either way.

Community and Support

The Grainfather has a larger, more established user community in the UK. Spare parts are easier to source, and you'll find more third-party recipes and advice online. The Brewzilla's community is growing quickly, but if you're troubleshooting an obscure issue at 11 p.m., the Grainfather's community depth is an advantage.

Which Should You Buy?

Choose the Grainfather G30 if:

• You want a polished mobile app and digital feedback
• You prefer an established product with proven longevity
• You're happy with 30-litre batches
• You value active community support and easy spare-parts access

Choose the Brewzilla 35L if:

• You want more capacity for the same or less money
• You prefer straightforward, app-free operation
• Your electrics can't comfortably handle a 4.8kW draw
• You're confident with troubleshooting from manuals and growing online forums

Both systems will serve you reliably for years. The real differentiator isn't performance—it's whether you want the convenience and community of the Grainfather, or the extra capacity and lower cost of the Brewzilla. Neither choice is wrong; it depends on your priorities.