HX, Venting, and Mechanical Design

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HX, Venting & Mechanical Design

Frequently asked questions and answers

Installation & General Information

Availability: Are all of those models going to be available in North America?

A: Yes.

Is common venting available for all models of 200 and 100 Vitodens boilers?

A: Common venting is available for the Vitodens 200, and it is currently not planned for the Vitodens 100.

What is the derated performance of the Vitodens boilers at medium and high altitudes, for both propane and natural gas?

A: Our boilers will be able to compensate this due to the included mass-flow sensor as part of Lambda Pro Plus.

What are the turn down ratios when using propane?

A: Stay tuned - this information will be shared once the Technical Documentation will be created.

Will the venting parameters be the same as the exiting 100 and 200 (i.e.) distance, material type etc?

A: Mainly, yes.

What's the difference between the current Lambda Pro and the new "Plus"?

A: "Plus" includes a mass flow sensor which is used to compensate influences of gas type, wind, vent length or high altitude to maintain rated input.

Efficiency and Performance

What are the AFUEs for the Vitodens 100 and 200 models?

A: AFUE 95

In 2021 the Vitodens 100 and 200 boilers have increased turn down ratios that are significantly larger than the competitors currently have in their product portfolios. What are the befits of a large turn down ratio? How does Viessmann guarantee that boiler maintains good combustion with such a high turn-down ratio?

A: With our next gen. Lambda Pro Plus combustion technology. We will even offer an ultra low NOx version going down to 9pm with the Vitodens 200.

How is the new gas valve different than previous gas valves and what is necessary to change fuel types?

A: Fuel type selection will be done during commissioning via ViStart or on the HMI. No hardware modification necessary.

Is the gas valve integrated into the coaxial fan? Does the fan speed up when flame signal drops?

A: The gas valve is integrated in the fan.

What type of stainless steel is in the construction of the heat exchanger? How much of the HX, front, and back plates is made of this steel? How is this better or the same than the competitor HXs?

A: Various stainless steels are used. Different components have different requirements regarding corrosion resistance, form-ability during production, etc.

All components of the heat exchanger are made of stainless steel (incl. front and back plate).

Is there still refractory in the heat exchanger or is it a wet wall?

A: It is a two-stage heat exchanger

Is the internal primary pump a high efficiency ECM pump?

A: Yes.

Lambda Pro Plus

How often does the Lambda process occur, what is the schedule for it?

A: An algorithm is stored in the controller. The boiler carries out a calibration independently depending on the operating conditions.

Can the Lambda process be disabled?

A: No. It is essential for combustion control and safety.

Safety Information

Does the condensate trap have a "blocked trap" alert?

A: Yes

What are the actual turn downs for Propane?

85 MBH: 1:6

120 MBH: 1:9

149 MBH: 1:7

199 MBH: 1:9

What is the maximum amperage rating of the main boards on both the 100s and 200s? 5 amps? 6 amps? More?

A: 6,3 A

Is the gas valve situated so that if there is condensation in the cabinet does not drip on it taking out the control board? Concerned about controls at the bottom of the boiler, and water damage. Will the panels be water resistant?

A: The gas valve does not come into contact with any condensate. The controls on the floor are water protected.

Is there an intake air filter for the 100 and 200?

A: No.

Is there a low-gas pressure safety for LP?

A: Vitodens 200 will offer an input to connect a low gas pressure enable to it.

For answers to additional questions, please contact us directly here.