Combi Boilers Built for Condo & Townhouse Mechanical Rooms
One compact wall-hung unit gives you heat and endless hot water — no tank, no lost floor space, no fighting your building's clearance rules.
One Unit for Heat and Hot Water
A condo combi boiler handles your space heating and your domestic hot water from a single wall-hung unit — no tank, no separate heat source, no lost closet space.
Most GTA condos and townhouses are already connected to a low-velocity or high-velocity air handler system, and a combi boiler easily supplies enough heat for that setup.
Sizing comes down to real usage — how many bathrooms and people are drawing hot water at once. One of our most common condo & townhouse installs is a 90,000 BTU/h heating / 199,000 BTU/h hot water combi — see the model comparison below.
One Unit, Two Jobs
Heat and endless hot water from a single wall-hung appliance — nothing else to install or maintain.
Works With Your Air Handler
Compatible with the low- and high-velocity air handler systems already common in condos and townhouses.
Sized to Real Usage
Matched to your bathroom count and household size — not a generic one-size swap.
Already stuck with a rental unit or an old tank?
If you're on a Reliance or Enercare rental contract, or your unit is an oversized floor tank eating up closet space, we can remove it and install a combi boiler you actually own.
We install and service
Combi Boilers Sized for Your Mechanical Room
Sizing comes down to bathroom count and household size — not a one-size swap.
Rinnai I-Series Condensing Combination Boiler | All-in-One Heating and Hot Water
Price range: $2,890.00 through $4,199.00
Navien Combi Boiler NCB-H Series Condensing | High Efficiency Heating & Endless Hot Water
Price range: $3,224.00 through $4,148.00
Viessmann Vitodens Condensing Combi Boiler | 95% AFUE
$55.00Side-by-Side Specs
A combi has two sides: heating for your home and hot water for your showers. Size each one.
Heating Side Sizing
| Home | Heating Side (BTU/h) |
|---|---|
| Under 2,000 sq ft | With only an air handler (high or low velocity forced air): 60,000–90,000 |
| Up to 2,800 sq ft | With in-floor heat, radiators or an air handler: 100,000–160,000 |
| Above 2,800 sq ft | Bigger buildings and bigger heating appliances: 180,000–220,000 |
Hot Water Side Sizing
| Household | Hot Water Side (BTU/h) | Hot Water Flow |
|---|---|---|
| Up to 3 People | 160,000–180,000 | About 5.5 GPM (One shower at a time) |
| Up to 4 People | 200,000 | About 8 GPM (Up to 3 showers) |
| Larger Households | A combi still works, but you may need a buffer tank and a recirculation system. | |
Flow rates are averages in Canadian conditions. Our most-installed condo and townhouse unit, the Rinnai IP090199C, has a 90,000 BTU/h heating side and a 199,000 BTU/h hot water side.
Round Out the Install
Outdoor Sensor
Hydronic piping
Circulator pump
Isolation valves
Expansion tank
Condo & Townhouse Installs
Frequently Asked Questions
Straight answers about combi boilers for GTA condos and townhouses.
I have a low- or high-velocity air handler. Will a combi boiler heat my place?
Yes — a combi boiler is the best fit for an air handler. The heating water stays in its own closed loop and never mixes with your hot water, and the boiler can run up to 180°F to get the most heat out of the air handler coil.
What size do I need with two or three showers and a few people at home?
We size it to your bathroom count and household. Our most common condo and townhouse unit, the 90,000 BTU/h heating / 199,000 BTU/h hot water Rinnai, runs two showers and the kitchen at the same time.
Can one unit really replace my water heater and my heating?
Yes. It's wall-hung, so it can take the place of your existing tank or wall-mounted water heater and handle the heat and the hot water together.
I rent my equipment from Reliance or Enercare. Can I switch to my own unit?
Yes. If your rental contract is up, or the rented unit has stopped working and you don't want to sign a new contract, we coordinate the return and the contract termination, then install a combi boiler you own. It's a good replacement for Baxi, Flowmax, and older Rinnai and Navien models.
What maintenance does a combi boiler need?
Very little. These units are solid and usually last 15 to 20 years, and they hardly need major service before the 15-year mark. A yearly clean and tune-up is ideal, and our maintenance plans start from $12.99. Without a plan, have a certified technician check the unit at least every 5 years.
How does the warranty work?
4Most gives you one year of free labour on any installation issue or repair. Most boiler manufacturers cover parts for 5 years and the heat exchanger, the most expensive part, for 15 years. After the first year, if you need service, you pay for the service call and the repair labour, but not for the part. We also offer extended labour warranties for 5 or 10 years.
Why isn't the installation price on the page?
In a condo, the biggest variable is venting. If your unit is up high or has no outside wall access, the vent may have to run through the ceilings of several rooms, and some buildings need approval for those changes. That makes the installation more expensive, so we quote each unit individually. Message us on WhatsApp with a photo of your setup for a quick answer.
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