Key Features & Specs: Gram Commercial (part of Hoshizaki) is a Danish brand known for ultra-efficient refrigeration. The G+ Maxi 610G is a generic reference to a Gram upright freezer around 600 L with a glass door – for instance, the Gram Eco Plus or Superior Plus series offer 610 L single-door freezers with optional glass doors. These units are typically top-mounted (compressor on top) upright freezers with fan-assisted cooling and exceptionally thick insulation (typically 70 mm). Gram freezers often operate in the range of –25°C to –5°C (adjustable), although for food storage one would set ~–18°C. One unique aspect: Gram designs for energy efficiency – some models achieve B or C energy class even with glass doors, thanks to low-energy compressors and Gram’s optimized airflow. The interior usually fits GN2/1 shelves, and net capacity is around 440 L (the heavy insulation takes up some space). Gram uses an advanced electronic controller with a digital display that can show alarm codes like F1, F2, etc., and even logs data for HACCP. The door is self-closing and often has a built-in door lock and heating to prevent condensation. Build material is high-grade stainless steel for hygiene. Dimensions: roughly 2125 mm H × 825 mm W × 725 mm D for a 600 L cabinet. Refrigerant in newer Gram models is R290 (older ones might be R404A or R134a). Many Gram units are “tropicalized” to climate class 5 (ambient up to 40°C).
Strengths: Gram’s reputation is energy efficiency and temperature stability. For example, their systems maintain very uniform temperature top-to-bottom (thanks to ventilated cooling and well-designed air circulation). In a UK environment, this means even if the kitchen gets warm or the door is frequently opened, the Gram recovers quickly and keeps all products safely frozen. The thick insulation and tight door seal minimize heat ingress – which is reflected in lower running costs. Users often notice the Gram runs less and is quieter because it holds temperature so well. Another strength is the intelligent control system: it will signal if something is wrong (e.g., flash an alarm if the cabinet temperature goes too high or if a sensor fails). Error codes like F1 for cabinet probe failure or F7 for high condenser temperature are documented in the manual – this helps with fast diagnosis (see Gram fault codes below). Gram freezers also come with features like a condenser filter reminder (“cnd” or “cL” alarm) to prompt cleaning, which can prevent bigger issues. Build quality is top-notch – doors have strong hinges and balloon gaskets (often 2-step gaskets for better seal), interior corners are rounded for easy cleaning, and many parts are modular. Longevity is a plus: it’s not uncommon for Gram freezers to last well over a decade in 24/7 operation. They also tend to be quieter than some others, due to good insulation and efficient fans.
Common Issues/Weaknesses: The main drawback of Gram is higher upfront cost. Also, because they are so well insulated, the net storage space is a bit less than other freezers of similar external size (e.g. net 440 L vs gross 610 L). Common issues are relatively rare, but if they occur, they often relate to the sophisticated controls. For example, a sensor error F1/F2 (cabinet or evaporator probe fault) will put the unit into an emergency run mode. This keeps it cold but not optimally; the probe needs replacement and the error cleared by a tech. Another issue: Gram’s condenser is top-mounted and usually has a filter; if not cleaned, you might get a “High Pressure” alarm or F7 error indicating the condenser is too hot. This is solved by cleaning the filter or condenser fins. The door seal, while excellent, can wear out or tear – a leaky seal can cause the compressor to overwork and maybe trigger temperature alarms. Replacing Gram gaskets can be a bit more costly than generic ones due to their custom design. Some users find the Gram digital controller a bit complex – there are many parameters (used for those energy-saving modes, etc.), and if mis-set, the freezer might not perform as expected. It’s best to leave the programming to professionals or follow the manual closely. Also, because Gram freezers hold temperature so well, they can build up frost if the auto-defrost cycle is too infrequent. Ensuring the auto-defrost is set correctly (usually Gram schedules defrost by time or compressor run hours) will prevent excessive ice on evaporator. In the UK, Gram’s support network is through Hoshizaki UK, which is generally good, but response times might not be as quick as domestic brands like Foster or Williams. In summary: Gram glass door freezers are excellent for energy-conscious operators – they save on electricity and maintain rock-solid temperatures. Just be prepared to invest in proper maintenance (scheduled cleaning, occasional sensor or part replacements) and consult the manual for any alarm codes. They rarely “break down” outright; most issues can be caught early by the control system’s warnings.