Viessmann Vitocal 100-AW
Air-to-Water Heat Pump

In many Toronto homes, yes. especially when the home already uses hydronic heating such as radiant floors, fan coils, or hydronic baseboards. The Vitocal 100-AW is designed specifically for air-to-water heating, which makes it a practical alternative to a traditional boiler.

The best results depend on your home's heat loss and the water temperatures your system needs. A proper assessment helps confirm whether it can fully replace the boiler or whether a hybrid setup is a better fit.

Yes. Radiant floor heating is one of the best matches for an air-to-water heat pump.

Radiant systems typically operate at lower water temperatures, which is where air-to-water heat pumps perform most efficiently. When designed properly, the Vitocal 100-AW can deliver steady, comfortable radiant heat while keeping operating efficiency high.

Modern cold-climate air-to-water heat pumps can perform well in Toronto winters, but sizing and system design is important.

Toronto's cold weather is very manageable for properly selected equipment, but the system must be designed around the home's heat loss and the required water temperatures. In some cases. especially in older or higher heat-loss homes. backup heat or a hybrid configuration may be recommended for added reliability during extreme cold snaps.

Sometimes, yes. but it depends on the type of emitters and the water temperatures they require.

Many older radiator and baseboard systems were designed for higher water temperatures than heat pumps typically run most efficiently at. The Vitocal 100-AW can still be used in these homes, but performance is best when:

• the home has reasonable insulation and heat loss
• the emitters can provide enough heat at lower temperatures
• the system is designed properly for real-world conditions

In some cases, upgrades to the distribution system or a hybrid setup may be the most practical approach.

Yes. In fact, hybrid systems are a common solution for Toronto retrofits.

A hybrid setup allows the Vitocal 100-AW to handle the majority of the heating season efficiently, while the boiler can remain in place for:

• peak-demand days
• extreme cold weather
• higher-temperature zones (if required)

This approach can reduce gas use while keeping the home comfortable and avoiding unnecessary system changes.

Yes, it can. The Vitocal 100-AW can be configured to support domestic hot water as part of a complete hydronic system.

The exact setup depends on your home's needs and whether domestic hot water is being integrated through a dedicated tank or an indirect tank. When planned correctly, it can provide both space heating and domestic hot water from the same system.

Rebates are often available for heat pump installations in Ontario, but programs and eligibility requirements change over time.

In many cases, rebate eligibility depends on factors such as:

• the specific equipment model
• cold-climate performance ratings
• installation requirements
• program timelines and funding availability

The best approach is to confirm current rebates at the time of quoting, and ensure the system is designed and documented properly to meet any program requirements.