Viessmann Vitodens Condensing Combi Boiler – Supplied & Professionally Installed by 4Most Energy
The Viessmann Vitodens 100-W combi boiler combines residential space heating and domestic hot-water production in a single wall-mounted appliance. Available in two sizes, the B1KE-120 and B1KE-199 models offer maximum space-heating inputs of 120,000 BTU/h and 199,000 BTU/h respectively, so the boiler can be matched to your home's heating load and hot-water demand. It is designed for homes that need a compact, integrated heating solution.
Its 95% AFUE rating and condensing technology help reduce fuel consumption when the system is correctly designed and operated. The boiler features Viessmann's Inox-Radial stainless-steel heat exchanger and MatriX-Plus burner, along with a modulation range of up to 10:1. This allows the burner to adjust its output to changing heating demand rather than operating continuously at maximum input.
The integrated domestic hot-water system provides on-demand hot water at approximately 3.3 US GPM (B1KE-120) or 4.7 US GPM (B1KE-199) at a 77°F temperature rise. Actual flow also depends on incoming water temperature and the required hot-water temperature, so household demand must be assessed before choosing between the B1KE-120 and B1KE-199.
Professional installation begins with evaluating the home's heat loss, existing hydronic distribution, gas supply, electrical service, and domestic hot-water requirements. The installation design must also address approved venting materials and clearances, condensate drainage, combustion air, piping arrangements, and applicable local codes. Natural gas or liquid propane compatibility must be verified against the exact appliance configuration and installation requirements.
The B1KE-120 and B1KE-199 models can serve properly designed radiant floor, hydronic baseboard, radiator, and multi-zone heating systems. Its compact wall-mounted format can also free up mechanical-room space by eliminating the need for a separate storage water heater.
4Most Energy will assess the application and confirm equipment suitability, installation scope, and any required system modifications before work begins. Final sizing should be based on a building heat-loss calculation and a separate review of peak domestic hot-water demand, rather than square footage alone.
Why Install the Viessmann Vitodens 100-W with 4Most Energy?
Key Features of the Viessmann Vitodens 100-W (B1KE-120 / B1KE-199)
- 95% AFUE efficiency condensing technology designed to extract useful heat from fuel efficiently.
- Dual-purpose heating provides hydronic space heating and on-demand domestic hot water in one appliance.
- Up to 120,000 BTU/h (B1KE-120) or 199,000 BTU/h (B1KE-199) space-heating input designed for residential heating systems with an appropriate calculated load.
- Up to 10:1 modulation adjusts burner output to changing heating demand.
- Inox-Radial stainless-steel heat exchanger engineered for heat transfer and resistance to the conditions associated with condensing operation.
- MatriX-Plus burner and Lambda Pro Plus combustion control designed to support controlled combustion and adaptation to gas-quality variations.
- Built-in Wi-Fi and ViCare compatibility supports compatible connected functions and system monitoring.
- Compact wall-mounted configuration combines heating and hot-water functions while reducing the need for separate equipment.
Technical Specifications
| Specification | Viessmann B1KE-120 | Viessmann B1KE-199 |
|---|---|---|
| Brand | Viessmann | Viessmann |
| Series | Vitodens 100-W | Vitodens 100-W |
| Model | B1KE-120 | B1KE-199 |
| Product type | Condensing combi boiler | Condensing combi boiler |
| Space-heating maximum input | 120,000 BTU/h | 199,000 BTU/h |
| Minimum space-heating input | Approximately 12,000 BTU/h on natural gas | Approximately 19,900 BTU/h on natural gas |
| Efficiency | 95% AFUE | 95% AFUE |
| Modulation | Up to 10:1 | Up to 10:1 |
| Fuel type | Natural gas / liquid propane, subject to configuration | Natural gas / liquid propane, subject to configuration |
| Domestic hot-water system | On-demand | On-demand |
| Continuous DHW flow | Approximately 3.3 US GPM at a 77°F temperature rise | Approximately 4.7 US GPM at a 77°F temperature rise |
| Maximum DHW heat-exchanger flow | Approximately 3.7 GPM | Approximately 5.3 GPM |
| Maximum DHW supply temperature | 140°F / 60°C | 140°F / 60°C |
Domestic hot-water flow is rated at approximately 3.3 US GPM (B1KE-120) and 4.7 US GPM (B1KE-199) at a 77°F temperature rise. Actual flow varies with incoming water temperature
and the required hot-water temperature, so peak household demand should be assessed before selecting the model.
| Installation & Physical Data | Viessmann B1KE-120 | Viessmann B1KE-199 |
|---|---|---|
| Electrical requirements | 120 VAC, single-phase, 60 Hz | 120 VAC, single-phase, 60 Hz |
| Venting type | Sealed-combustion condensing appliance; approved vent materials, configuration, and diameter per the manufacturer's installation manual | Sealed-combustion condensing appliance; approved vent materials, configuration, and diameter per the manufacturer's installation manual |
| Dimensions (H × W × D) | 33.75 × 17.75 × 19.75 in. | 39 × 17.75 × 21.75 in. |
| Weight | Approximately 110 lb | Approximately 190 lb |
| Mounting | Wall-mounted | Wall-mounted |
| Heat exchanger | Inox-Radial stainless steel | Inox-Radial stainless steel |
| Burner | MatriX-Plus | MatriX-Plus |
| Connectivity | Built-in Wi-Fi / ViCare compatible | Built-in Wi-Fi / ViCare compatible |
The B1KE-120 and B1KE-199 are sealed-combustion condensing appliances. Approved vent materials, configuration, diameter, clearances, and condensate drainage
must follow the manufacturer's installation manual and applicable local codes. Natural gas or liquid propane compatibility is confirmed
against the exact appliance configuration before installation.
Which Viessmann Vitodens 100-W Model Is Right for Your Home?
The B1KE-120 and B1KE-199 are intended for homes requiring both hydronic heating and on-demand domestic hot water. The appropriate application depends on the building's heat loss, hot-water demand, and the characteristics of the existing heating system.
| Home requirement | Preliminary guidance |
|---|---|
| Heating capacity | B1KE-120: up to 120,000 BTU/h · B1KE-199: up to 199,000 BTU/h maximum space-heating input |
| Home size | B1KE-120: small-to-medium homes and some larger, well-insulated homes · B1KE-199: larger homes or homes with higher heat loss; verify by heat-loss calculation |
| Occupants | Best evaluated according to actual hot-water use rather than occupant count alone |
| Bathrooms | Assess the number of bathrooms and likelihood of simultaneous use |
| Heating systems | Compatible hydronic applications may include radiators, baseboards, and radiant in-floor heating |
| Hot-water demand | B1KE-120: approximately 3.3 GPM · B1KE-199: approximately 4.7 GPM at a 77°F temperature rise |
| Higher demand | Choose the B1KE-199 when the calculated heating load or hot-water demand exceeds the B1KE-120; consider another suitable configuration if it exceeds the B1KE-199's capabilities |
Recommended Occupancy Guide
- 1–2 occupants: The B1KE-120 may be suitable for a home with moderate heating and hot-water requirements.
- 3–4 occupants: The B1KE-120 may be suitable where simultaneous shower and fixture use is moderate; the B1KE-199 suits higher simultaneous use.
- 5 or more occupants: The B1KE-199 is often the better fit; requires closer assessment of peak hot-water demand, bathroom count, and building heat loss.
These occupancy ranges are preliminary selection guidance, not manufacturer-rated household capacities. 4Most Energy confirms final sizing with a heat-loss calculation and a review of peak domestic hot-water demand before ordering.
Our Installation Journey
| Phase | Description & Key Requirements | |
|---|---|---|
| Step 1 | Request an Installation Quote | Provide the existing heating system details, property information, and project requirements. |
| Step 2 | System Sizing Consultation | Evaluate building heat loss, hot-water usage, existing hydronic distribution, fuel supply, and electrical requirements. |
| Step 3 | Equipment Recommendation | Confirm whether the B1KE-120 or B1KE-199 is appropriate or whether a different capacity or system configuration is needed. |
| Step 4 | Installation Scheduling | Agree on the project scope, equipment availability, site requirements, and installation date. |
| Step 5 | Removal of Existing Equipment | Disconnect and remove the existing boiler and associated equipment where included in the approved quotation. |
| Step 6 | Installation & System Connection | Mount the boiler and complete the specified heating, domestic-water, gas, venting, condensate, electrical, and control connections. |
| Step 7 | Safety & Operational Testing | Check the required safety functions, combustion setup, gas connections, water connections, and system operation. |
| Step 8 | Final Commissioning | Configure the controls, verify heating and hot-water operation, and explain the system's basic operation to the homeowner. |
What Installation Includes
The exact inclusions depend on the approved quotation. A typical installation scope may include:
- Supply of the specified Viessmann B1KE-120 or B1KE-199 appliance.
- Removal of existing equipment if expressly included.
- Standard boiler mounting and required system connections.
- Approved venting and condensate arrangements within the quoted scope.
- Connection to existing compatible heating distribution and domestic-water piping.
- Controls setup, testing, and commissioning.
What May Be Excluded
Unless specifically included in writing, additional work may be charged separately for:
- Major gas-line upgrades or meter-related work.
- Electrical service upgrades or new circuits.
- Extensive vent-route modifications or structural alterations.
- Hydronic piping replacement, additional zones, or major system redesign.
- Remediation of existing code violations.
- Water treatment, chimney work, drywall repairs, painting, or other finishing work.
- Permits, inspection fees, or third-party services not included in the quotation.
Payment Process
- Receive and review the written quotation and installation scope.
- Confirm the project schedule and any required deposit.
- Pay according to the agreed payment milestones.
- Settle the remaining balance according to the written terms.
Manufacturer Warranty
| Component | Warranty Period |
|---|---|
| Parts warranty | 5 years |
| Heat exchanger warranty | 10 years |
Coverage depends on appliance registration, installation requirements, application, and current Viessmann warranty documentation. 4Most Energy completes the required start-up documentation to support warranty coverage. 4Most Energy's installation labour warranty terms are provided in writing with your quotation.
Warranty Claim Process
- Contact 4Most Energy with the model, serial number, installation date, and description of the issue.
- Provide proof of purchase and installation records where requested.
- Arrange an inspection or diagnostic visit if required.
- Determine whether the issue falls under manufacturer parts coverage, installer labour coverage, or a separate paid service.
- Submit the applicable claim through the manufacturer's authorized process.
- Complete the approved repair or replacement in accordance with the applicable warranty terms.
Warranty approval, covered expenses, and replacement decisions remain subject to the responsible provider's terms.
Optional Maintenance Plans
Maintenance plans starting from $12.99/month — keep your heating system operating as intended with a maintenance plan tailored to your equipment and service needs. Potential plan benefits, subject to the plan selected, may include:
- Scheduled preventive maintenance.
- Inspection of system operation and safety components.
- Review of boiler controls and operating performance.
- Early identification of service concerns.
- Maintenance records and service reminders.
- Access to plan-specific service benefits.
Annual maintenance should follow the manufacturer's requirements and the installed system's operating conditions. Contact 4Most Energy to confirm current plan pricing, covered services, eligibility, and enrollment terms.
Service Area
Greater Toronto Area (GTA) and surrounding regions
Toronto, Markham, Richmond Hill, Vaughan, Aurora, Newmarket, Scarborough, Brampton, and Mississauga.
Extended Service Area: Stouffville, Oshawa, Barrie, Orangeville, Hamilton, St. Catharines, Guelph, Kitchener.
Frequently Asked Questions
Can the Viessmann Vitodens 100-W (B1KE-120 and B1KE-199) provide both heating and hot water?
Yes. Both the B1KE-120 and B1KE-199 are combi boilers that provide hydronic space heating and on-demand domestic hot water in one wall-mounted appliance, so a separate storage water heater is not needed.
How much hot water do the B1KE-120 and B1KE-199 deliver?
The B1KE-120 delivers approximately 3.3 US gallons per minute and the B1KE-199 approximately 4.7 US gallons per minute at a 77°F temperature rise. Actual flow varies with incoming water temperature and the required hot-water temperature, so 4Most Energy assesses your peak hot-water demand before recommending the right model.
What size home are the B1KE-120 and B1KE-199 suitable for?
The B1KE-120 (up to 120,000 BTU/h space-heating input) is generally suited to small-to-medium homes and some larger, well-insulated homes. The B1KE-199 (up to 199,000 BTU/h) is intended for larger homes or homes with higher heating and hot-water demand. Final sizing should be based on a building heat-loss calculation and a review of peak hot-water demand rather than square footage alone.
Can the B1KE-120 and B1KE-199 run on propane?
Natural gas or liquid propane may be used with either model, subject to the exact appliance configuration and installation requirements. 4Most Energy verifies fuel compatibility before installation.
What heating systems do the B1KE-120 and B1KE-199 work with?
Both models can serve properly designed radiant floor, hydronic baseboard, radiator, and multi-zone heating systems. Built-in Wi-Fi also supports compatible ViCare monitoring and control features.
