There is a particular kind of satisfaction that comes from standing inside a finished building and knowing that almost nothing inside the mechanical room resembles what most contractors in this country have ever installed. That was the situation for a three-storey, 12-unit residential walkup in southern Alberta.
These are not luxury condominiums. These are straightforward, code-compliant, three-storey wood-frame walkups. What makes them extraordinary is what runs through the walls, under the floors, and through the mechanical rooms – a fully integrated air-to-water heat pump system paired with hydronic in-floor heating, fan coils, heat interface units, and heat recovery ventilation in every suite. The system is elegant in concept and, as with anything genuinely new, humbling in execution.
At the heart of each building sits a central mechanical plant built around NTI Boilers’ Verta Series air-to-water heat pumps, sized across multiple five-ton units depending on the building’s peak load profile and Alberta’s climate zone requirements. The Verta units serve as the primary heating and cooling source for the entire building, feeding a centralized hydronic loop layout that distributes to every suite through a combination of buffer tanks and storage tanks designed to flatten demand spikes and prevent short cycling.
Southern Alberta is not a forgiving climate for heat pumps. Anyone who has stood outside in January during a chinook knows that temperatures can swing 30 degrees in a matter of hours, and that -30 C design days are not hypothetical. For that reason, the Verta units are backed up by a pair of NTI TRX199 condensing gas boilers, not as a crutch, but as an intelligent dual fuel strategy.
Hybrid system approach
When ambient temperatures push below the heat pump’s efficient operating threshold, the TRX199s step in. The whole plant is orchestrated by NTI’s Hydro 32-7 hydronic control platform, which manages heat pump staging, boiler lockout temperatures, buffer tank setpoints, and the interaction between heating and domestic hot water demand.
Getting it commissioned correctly, all while utilizing these products for the first time, requires patience, remote support, and more than a few late evenings re-reading documentation.
If the mechanical room is the brain of the system, each suite is its own nervous system. Every unit in the building features in-floor hydronic heating distributed through Giacomini spider mesh floor panels and machined brass manifolds, with Tamas Z Block pump modules providing dedicated circulation for each suite’s radiant loop. The Z Block is a compact, pre-packaged pump assembly that keeps the hydronic installation clean and serviceable.
Cooling and supplemental heating are handled by a Giacomini KFC-M multi-zone fan coil in each suite. The KFC-M is a European-style four-pipe hydronic fan coil that can handle both heating and cooling from the central plant.
It is a product category that is thoroughly mature in Europe and commercially common in high-rise residential applications in Canada. Each zone has an independent half ton fan that can deliver the air on its own per zone or linked together as a single zone application.
Mini mechanical room
Tying the suite level systems together is the Giacomini heat interface unit, the HIU. This is the component that most Canadian trades have never encountered outside of a mechanical engineer’s drawing set. The HIU is a fully integrated interface module that manages domestic hot water production through an instantaneous plate heat exchanger, controls the flow of hydronic heating to both the in-floor loop and the fan coil, and optionally incorporates water metering and energy monitoring for sub metering purposes. It is, in effect, a mini mechanical room on a wall plate.
Each suite also receives a Fantech heat recovery ventilator. The HRV still delivers fresh air continuously to occupants without throwing away the energy used to condition it. The HRV integration was straightforward compared to the hydronic scope, but it is a non-negotiable piece of the efficiency puzzle in a climate with -30 C winters, and a building envelope designed to hold the desired temperature in.
In a project full of unfamiliar equipment and first-time applications, the quality of the installing contractor is not a detail, it is the difference between success and failure; Rylan and Jason from Schaffer Plumbing and Heating carried out the installation with their crews.
Pushing through
It would be dishonest to write about a project like this without acknowledging that pioneering work is not clean work. There were problems. There were commissioning challenges that required additional site visits and manufacturer support calls. There were moments when two compatible components turned out to require a different configuration than conventionally thought. There were sequences that had to be reprogrammed, flow rates that had to be rebalanced, and assumptions that had to be discarded.
None of that is a criticism of the products or the trades. It is simply the honest reality of installing a system at a scale and in a building typology where no one has a complete playbook. HIU systems at this level of integration are standard practice in Italy, the UK, Germany, and Scandinavia, where district heating is a century-old industry.
In Canada, in a wood-frame, 12-plex in Alberta, there is no precedent to lean on. You are writing the playbook as you go. The mistakes made on the first building became the checklist for the second. The commissioning challenges surfaced configuration details that are now documented.
The questions that stumped everyone in the beginning have answers in practice. That is not failure, that is how any new application matures into a repeatable process. The contractors who installed this system are now more capable than anyone else in Alberta of installing it.
That is worth something.
Shifting methodologies
Before the second building broke ground, the project team made a deliberate decision to invest in the kind of knowledge that cannot be acquired from a spec sheet. Jason Wydner from Schaffer Plumbing and Heating, Justin Arneson from Bartle and Gibson, the building developer, and myself travelled to Giacomini‘s manufacturing facility in Italy for dedicated product and application training. The questions that had required manufacturer support calls had measurable answers before the first building was complete.
Anything new is not for the faint of heart. The specification process alone, coordinating NTI, Giacomini, Fantech, HBX, and Tamas into a coherent design took time and required manufacturer support that goes well beyond what a typical residential project demands. The owners had to be willing to invest in something that they had never seen before. The contractors had to be willing to learn on the job without a safety net of “We’ve done this a hundred times.” The consulting and rep support had to be willing to provide real technical depth, not just product brochures.
The Canadian residential multi-unit market is at an inflection point. Energy codes are tightening. Electrification targets are being written into provincial and municipal policy. The economics of natural gas are shifting. Owners and developers who are building 12-plexes, townhouse complexes, and low-rise multi-family buildings today will potentially face a future where the all-gas heating plant is either code-prohibitive or economically uncompetitive. The question is not whether the industry moves toward hybrid hydronic systems, it is whether it moves proactively or reactively.
European tech, Canadian installation
Projects like this one answer that question. They demonstrate that the technology works not in a European demonstration project, not in a Vancouver luxury tower, but in a straightforward wood-frame building in southern Alberta, installed by a local plumbing and heating contractor, with products that are available through Canadian distribution channels.
The system’s projected operating efficiency is dramatically better than a conventional gas-fired multi-unit heating plant paired with individual suite water heaters. The tenants experience individual suite temperature control, on-demand DHW, and quiet fan coil delivery.
The building typology matters too. Multi-billion-dollar towers have always had access to sophisticated mechanical systems because they have the engineering budget and the floor space to justify them. What this project demonstrates is that a developer building a 12-unit walkup, the bread and butter of Canadian housing supply, can access the same level of system sophistication with the right product choices and the right technical support. The economics work. The products exist. The trades, once trained, can execute.