Energy Efficient Water Heaters for 120 Spencer Street Retrofit Mechanical Plant

The commercial retrofit HHW project at 120 Spencer Street demonstrates the effectiveness of modular water heaters for large-scale plant upgrades.

120 Spencer Street is a commercial tower in Melbourne’s CBD. Spanning over 20 floors, this building is home to both corporate and commercial spaces and is walking distance from bustling Southern Cross station. The mechanical HHW plant upgrade utilises Meridian Link Condensing water heaters to reliably support the building’s heating demands within a compact footprint.

120 Spencer Street
120 Spencer Street

Project Overview

Automatic Heating assisted with early-stage design, supply and commissioning for this project.

The pre-existing instant steam boilers had been operating for around 30 years and were nearing end of life. To meet tenant demands, the new system demanded a modern, energy efficient space heating solution. Automatic Heating supplied 10 Meridian Link Condensing water heaters, cascaded together in two rows of five.

These Type-A Meridian Link Condensing water heaters form part of a complete HHW system that provides 1,500kW total output. This state-of-the-art water heater solution reduces gas usage and increases redundancy and modulation.

Engineered Solutions

Meridian Link Condensing water heaters are cascadeable up to 24 units, providing big power in a compact footprint. By configuring 10 Meridian Link water heaters together, this retrofit heating system meets operational demand while also maximising plant room floor space.

Features of this HHW system include:

  • 10 x Meridian Link Condensing water heaters for energy efficient outcomes
  • 2 x Hot Water Heater Cascade Controllers
  • 1000L Duraflex Expansion Tank
  • Duraflex Smart Refill Unit

The modular design of the water heaters allowed for seamless expansion of the system to meet all operational requirements within the allocated plant room footage.

120 Spencer Street
120 Spencer Street

Project Outcome

Our team delivered a commercial retrofit solution that ensures long-term performance and reliability.

Key benefits include:

  • 98.5% net efficiency at 80°C
  • 1,500kW output to meet operational demand
  • Full BMS integration with RS485 connection directly to each boiler for HLI points
Project Images