The performance of a boiler is a crucial factor in determining its efficiency and effectiveness in producing steam. The performance of a boiler is measured using various parameters to evaluate its productivity and fuel consumption. These parameters include the amount of water evaporated per hour, the steam produced in kg/h, and the steam produced in kg/kg of fuel burnt.

Amount of water evaporated per hour:
- This parameter measures the rate at which water is converted into steam in a boiler.
- It indicates the boiler's capacity to produce steam and is measured in units of water evaporated per hour (e.g., liters or kilograms).
- A higher rate of water evaporation indicates a more efficient boiler that can produce a larger amount of steam in a given time.

Steam produced in kg/h:
- This parameter measures the actual amount of steam produced by the boiler in a specific time frame, typically in kilograms per hour (kg/h).
- It represents the boiler's productivity and shows how much steam it can generate to meet the required demand.
- A higher value indicates a more productive boiler that can produce a greater amount of steam.

Steam produced in kg/kg of fuel burnt:
- This parameter measures the efficiency of a boiler in converting fuel into steam.
- It indicates how much steam can be produced from a certain quantity of fuel burnt.
- A higher value indicates a more efficient boiler that can generate a greater amount of steam with less fuel consumption.

All of these parameters are essential in evaluating the performance of a boiler. They provide insights into the boiler's productivity, capacity, and fuel efficiency. By measuring these parameters, engineers and operators can assess the boiler's effectiveness, identify potential issues, and optimize its performance to ensure maximum steam production with minimal fuel consumption.

In conclusion, the performance of a boiler is measured by the amount of water evaporated per hour, the steam produced in kg/h, and the steam produced in kg/kg of fuel burnt. These parameters collectively determine the boiler's efficiency, productivity, and fuel consumption, allowing for effective evaluation and optimization of its performance.