Map the distribution
Ask which radiators or floor loops belong to each thermostat. A collection of pipes in a mechanical room does not by itself explain the approved zone arrangement.
Request boiler service for a property in Mississauga. Include the equipment, the problem or planned work, and your location so the request can be reviewed.
A boiler can supply radiators, in-floor loops, domestic hot water, or several of these functions. During a property handover, establish which pipes, zones, and controls belong to each purpose. If a room stays cold, this basic map helps the contractor distinguish an appliance concern from local heat delivery.
Collect boiler and control labels, any zone drawing, service records, and a list of affected rooms. Explain whether domestic hot water works normally.

Ask which radiators or floor loops belong to each thermostat. A collection of pipes in a mechanical room does not by itself explain the approved zone arrangement.
Request model-specific operating and maintenance instructions. Pressure adjustments, filling, draining, and internal appliance work should be left to appropriate service personnel.
Note which zones heat, when the concern appears, and any accessible error display or leak. A service record should connect those observations with the diagnosed fault.
Have the appliance and relevant zones assessed before accepting a whole-system replacement. Retain the updated zone map, control settings, and maintenance instructions as part of the property's equipment handover.
Leave fuel, combustion, electrical, and pressure-system work to a qualified contractor. Do not adjust safety devices or repeatedly add water to a system with an unexplained leak or pressure loss.
Send the property location, equipment information, and requested work for review.