Nu-Mun Contracting – Cube in Calgary, AB

Project Overview:
First Residential SVF Conversion in Calgary, Alberta

Nu-Mun Contracting

Project Images:

SVF boiler installation in The Cube

A Weil-McLain Case Study


A construction project in Calgary, Canada, called Cube, is the first building in Canada to feature the latest advancement in condensing boiler heating technology from Weil-McLain.

The Cube – a 52,000 square-foot, seven-story building in Calgary’s Beltline neighborhood – features 65 one and two bedroom residential rental units and is just a short walk from the city’s downtown area.


  • Two SVF 1100 MBH high-efficiency condensing gas boilers with industry-leading thermal efficiencies up to 97.1%, a clover-shaped stainless steel fire tube heat exchanger
  • Boilers include intuitive and user-friendly Unity control system to simplify installation and operation

Next Gen Heat

To conduct the HVAC overhaul, the building’s developer turned to Nu-Mun Contracting, a Calgary-based HVAC company offering commercial and residential plumbing, heating, and air-conditioning services.

Working with the developer and the project engineer, David Muncaster, owner of Nu-Mun Contracting, devised a strategy to convert the building to a high efficiency boiler system and recommended specification of the latest advancement in condensing boiler technology: the Stainless Vertical Firetube (SVF) from Weil-McLain.

Eric Cameron, project manager with Nu-Mun Contracting, oversaw the boiler installation at the building.

“We have a long standing relationship with Weil-McLain, and we trust the quality of their boilers,” said Cameron. “The SVF boilers were the perfect match for the space.”

“With superior thermal efficiencies, the SVF line offers cost savings and energy efficiencies that could allow owners to qualify for local utility rebates, if available,” said Craig Demaray, National Sales Manager with Weil-McLain Canada. “The SVF also meets all market-driven bid specifications, and is designed for most heating needs including applications in schools and other educational facilities, public institutions, healthcare buildings, offices, hotels, multi-family, churches and more.”

The high-water content design of SVF heat exchanger means a low loss header is not required providing cost savings so the boilers can simply be piped in a primary-secondary design.

The on-board Unity control system allowed the boilers to communicate with each other in a Multiple Boiler System. In this configuration, a master boiler controls the modulation and sequencing of the boilers on the network to achieve the desired system supply temperature. “With the automatic sequencing feature, the boilers communicate directly with one another so they sequence themselves and rotate as needed,” said Cameron. “They operate to optimize energy use and efficiencies. When heat is required, the boilers will stage on as needed.”

“The start-up and installation progressed smoothly in part due to the way these boilers are designed,” said Cameron. “The SVF boilers offers time-saving installation features that include heavy-duty roller casters for improved maneuverability in confined spaces, industrial-grade leveling legs, and an end-shot burner design requiring only 18 inches overhead space.”

In addition to offering class leading serviceability, the new boilers also offer low operating costs and are expected to bring energy savings and a reduction in gas usage to the facility.