Viessmann 7722777 Vitodens 100-W B1KE-199 199,000 BTU High Efficiency Combination Boiler

Viessmann 7722777 Vitodens 100‑W B1KE‑199 199,000 BTU High‑Efficiency Combination Boiler

Looking for one appliance that heats your whole home and gives you steady hot water? Meet the Viessmann Vitodens 100‑W B1KE‑199. This wall‑hung, high‑efficiency condensing combi boiler is designed to be simple to own and easy to live with. It sips fuel at 95% AFUE (think: more of your gas money turns into heat), smoothly ramps output with a 10:1 turndown ratio, and uses a long‑lasting Inox‑Radial stainless steel heat exchanger. Built‑in WiFi lets you use the ViCare app to adjust settings and get helpful alerts right from your phone.

• Brand: Viessmann
• MPN: 7722777 (Vitodens 100‑W B1KE‑199, Combi)
• Type: Wall‑Mounted, Gas‑Fired Condensing Combi Boiler
• Fuel: Natural Gas or LP (field convertible; push‑button software change)
• Space‑Heating Input: 19.9–199 MBH
• DOE Heating Capacity: 187 MBH
• Net AHRI Rating: 163 MBH
• AFUE: 95%
• Turndown Ratio: 10:1
• DHW Continuous Draw: Up to 4.7 GPM @ 77°F rise
• DHW Max Supply Temperature: 140°F
• DHW Minimum Activation Flow: 0.5 GPM (plate heat exchanger)
• Vent Size / Options: 3" flue; concentric 80/125 mm (≈5" × 3") or 100/150 mm; two‑pipe 3" or 4"
• Max Equivalent Vent Lengths: Coax 80/125: 33 ft; Coax 100/150: 43 ft; Two‑pipe 3": 98 ft; Two‑pipe 4": 148 ft
• NOx Emissions: < 20 ppm (at 3% O₂)
• Altitude: Up to 10,000 ft without input de‑rate (software setting)
• Noise Level: < 59 dBA at 1 m
• Heating Connections: 1" NPT (supply/return)
• DHW Connections: 1" NPT (hot supply / cold inlet)
• Gas Connection: 3/4" NPT (female)
• Dimensions (W × D × H): 17.75" × 22" × 34.5" (450 × 556 × 875 mm)
• Included: Built‑in boiler/DHW pump, 30 psi boiler PRV, 150 psi DHW PRV, outdoor sensor, mounting kit
• Warranty: Limited lifetime (residential applications)

High Efficiency, Low Operating Costs

AFUE is like miles‑per‑gallon for boilers. At 95% AFUE, most of the fuel you buy becomes useful heat instead of waste. The wide 10:1 turndown means the B1KE‑199 can run gently on mild days and ramp up when it’s freezing—saving gas while keeping rooms comfortable.

On‑Demand Domestic Hot Water

No storage tank to run out or reheat. When a faucet opens, the combi’s plate heat exchanger provides up to 4.7 GPM at a 77°F rise—plenty for busy families. A low 0.5 GPM activation flow helps smaller draws feel more responsive.

Durable Stainless Steel Core

Condensing boilers make a lot of moisture in the heat exchanger—so materials matter. Viessmann’s Inox‑Radial stainless steel heat exchanger, paired with the MatriX‑Plus burner, is built to resist corrosion and stay efficient year after year. It’s backed by a limited lifetime residential warranty for peace of mind.

Quiet, Compact, Easy To Install

At about 17.75" wide, this wall‑hung boiler tucks neatly into utility rooms and closets. It allows zero clearance to combustibles and offers front‑access service so technicians can work quickly. Sound levels under 59 dBA help keep things calm at home.

Flexible Fuel & Venting

Sticking with natural gas or switching to propane later? Either works. For venting, choose concentric (coaxial) or two‑pipe layouts. With equivalent lengths up to 148 ft (4" two‑pipe), longer runs are supported. The unit is rated for altitudes up to 10,000 ft without reducing input and meets <20 ppm NOx requirements.

Smartphone Control Built In

Connect to WiFi and use the ViCare app to adjust temperatures, set hot‑water schedules, and receive helpful notifications. It’s an easy way to stay in control from anywhere.

Upgrade your home's heating and hot water system, enjoy uninterrupted comfort, and experience the energy-efficient benefits of the Viessmann Vitodens 100 B1KE-199. Shop with Plumbing Deals to ensure your home is warm and inviting all year round!

Want to learn more about this boiler? Read more about it in our article on the best steam boilers.

Want to learn more about this high efficiency boiler? Check out our article on all things high efficiency boilers.