A long-term building decision

The HVAC system is the heart of a building. A design selected during construction can remain in service for 30 years or several decades, affecting occupants and the environment throughout that period. The right choice depends on use, unit count, climate, construction economics, user expectations, maintainability, and available space.

Heating is commonly provided either by a central boiler room or by one package boiler per unit. Cooling choices include central chillers and independent systems such as VRF, split units, ducted splits, mini-chillers, and evaporative equipment.

Equipment and installation cost

For buildings with roughly more than ten units, one properly designed central plant can cost less than numerous package boilers once the separate appliances, flues, gas meters, gas piping, water connections, controls, and installation labor are counted. As the number of units increases, the central option generally becomes more economical.

In a small building, a central plant may have a higher initial mechanical cost. A complete comparison must also value the floor area recovered inside units, simplified utility shafts, property marketability, expected replacement cycles, and operating maintenance.

Package boilers for every unit

An individual system requires gas distribution, metering, flue arrangements, and appliance space for every unit. A central plant concentrates fuel-consuming equipment in a dedicated service area and distributes heating water through supply and return pipes.

Space required for pipework

Multiple gas and water risers require larger shafts and corridors. In dense projects, those shafts can reduce saleable or usable floor area. Central systems usually need fewer fuel lines and place service equipment outside living spaces. The architectural value of this difference should be included in the financial comparison.

Operation and maintenance

A central boiler room can be inspected and serviced by trained personnel without entering homes. Equipment capacity can be staged, pumps can be optimized, and upgrades can be applied centrally. Individual package boilers give each resident direct control, but multiply the number of burners, pumps, heat exchangers, controls, and service visits across the property.

Safety

Combustion equipment inside every unit introduces multiple gas connections, burners, air-supply paths, and flues into occupied spaces. Safe installation and regular maintenance are essential in either design, but centralizing combustion in a purpose-designed mechanical room can simplify professional inspection, ventilation, detection, and emergency control.

Resident comfort

Well-designed central systems can provide stable heat and domestic hot water without appliance noise or equipment occupying the unit. Individual systems offer direct local scheduling but may create noise, space, pressure, and maintenance constraints. Comfort depends heavily on correct sizing, hydraulic balancing, insulation, controls, and commissioning.

Environmental considerations

Efficient central boilers can stage capacity to match demand and can be upgraded as a plant. Fewer combustion appliances can simplify emissions management. Actual performance, however, depends on plant efficiency, distribution losses, controls, maintenance, and occupant behavior.

Common central-plant problems and their solutions

• Unfair shared bills: install Bruntab heat meters and allocate measured energy to each unit.
• Excessive fuel use: tune burners, reset temperatures, insulate pipework, use variable-speed pumps, and monitor demand.
• Uneven heating: perform hydraulic balancing and verify supply/return temperatures and flow.
• Poor maintenance: implement planned inspections and datalogger alarms.
• Unknown faults: trend temperature, pressure, flow, fuel, and pump operation in an energy-management platform.

Architectural comparison

A central plant preserves internal wall and cabinet space and reduces the number of flues and gas risers. It does require an accessible mechanical room and coordinated vertical pipework. Individual boilers reduce central plant area but place equipment, exhaust, and maintenance access inside or next to each unit.

Example: a 99-unit building

For a large residential project, compare the full lifecycle of one central plant with 99 individual systems: capital equipment, fuel and water infrastructure, shafts, saleable area, annual service, appliance replacement, safety inspections, energy performance, resident comfort, and billing. A central system combined with Bruntab unit-level heat metering retains central-plant advantages while solving the traditional problem of an unallocated shared bill.

Decision summary

There is no universal answer for every property. Small buildings may favor independent equipment, while larger buildings often gain economic, architectural, maintenance, and safety advantages from a central plant. The decision should be based on a documented lifecycle study rather than equipment purchase price alone.