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Ninja PB055AST: problems, parts and running costs

Checked: 2026-10-30

Summary

The Ninja PB055AST Stone single-serve coffee maker accepts compatible pods or loose grounds in four styles, but owners report water leaks, grounds escaping into the cup and pods erupting from the brew head, and no independent failure rate exists for this model. Running costs are low, with no scheduled proprietary filter replacement and electricity use of roughly $7.30 per year at typical rates. It is worth buying below about $95, and above $125 you should compare the smaller PB051 instead. [1] [4] [5]

Common problems and fixes

Parts and consumables

Yearly running cost

No proprietary pod subscription and no scheduled filter replacement, so the machine adds no recurring parts cost. Coffee is the main expense: one 15g serving daily works out to 5.475 kg per year, about 12.07 lb, which at an illustrative $15/lb is about $181 per year; one compatible pod daily at $0.50 is $182.50 per year. Electricity is minor: drawing 1.5 kW for four minutes a day is 36.5 kWh per year, about $7.30 at $0.20/kWh, though preheat, heater cycling and standby will differ. These are illustrative scenarios, not measured averages, and no representative yearly repair budget was found. [7]

When it is a good buy

US prices checked October 2026: Best Buy lists the exact Stone model at $139.99, sold out; Legend Micro lists it at $94.99, open-box and out of stock, with a 90-day seller warranty; Hearth and Kit lists $125.35, out of stock. Marketplace asking prices for this model run from $84 to $166 or more across new and used conditions, but seller authorization and condition are unverified. [1] [2] [3] [4]

Sources