Viessmann 7438702 Sensor #5, DHW Immersion Ntc Review

First Impressions of Viessmann 7438702 Sensor #5, DHW Immersion Ntc

The Viessmann 7438702 Sensor #5, DHW Immersion Ntc isn’t exactly the kind of gear that gets your adrenaline pumping like a new tactical knife or a high-powered optic. However, for those of us who rely on Viessmann boilers to keep our families warm and supplied with hot water, a malfunctioning sensor can quickly turn into a crisis. This specific sensor plays a critical role in regulating the domestic hot water (DHW) temperature, ensuring comfort and efficiency.

What led me to this was a frustrating cold shower incident. My trusty Viessmann Vitodens 200-W was acting up, delivering lukewarm water at best. After some troubleshooting and a little help from a local HVAC buddy, the culprit was identified: a failing DHW sensor.

The packaging is straightforward, nothing fancy, but adequate for protecting the sensor during shipping. Holding the Viessmann 7438702 Sensor #5, DHW Immersion Ntc in my hand, it feels solid and well-constructed, exactly what I’d expect from a reputable Viessmann part. The brass fitting is clean, and the sensor itself seems robust.

I considered an aftermarket sensor, but ultimately decided against it. Past experiences taught me that saving a few bucks on critical components often leads to headaches down the road. The peace of mind that comes with using a genuine Viessmann replacement part is worth the extra cost. My initial impression is cautiously optimistic; I’m hoping this sensor will restore my boiler to its former glory.


Real-World Testing: Putting Viessmann 7438702 Sensor #5, DHW Immersion Ntc to the Test

First Use Experience

My testing ground was my own utility room, the heart of my home’s heating system. The installation process, performed by a licensed HVAC technician, was relatively straightforward. After replacing the sensor, we fired up the boiler and monitored the DHW temperature.

The difference was immediately noticeable; the water heated up quickly and maintained a consistent temperature. There were no error codes or unusual behavior from the Vitotronic control unit. The Viessmann 7438702 Sensor #5, DHW Immersion Ntc appeared to be functioning perfectly.

Extended Use & Reliability

Now, several months later, the Viessmann 7438702 Sensor #5, DHW Immersion Ntc continues to perform flawlessly. We haven’t experienced any fluctuations in DHW temperature or any related issues with the boiler. The sensor has proven to be a reliable and essential component of my home’s heating system.

There’s no visible wear and tear, as the sensor is constantly submerged in water within the boiler. Maintenance is non-existent; once installed, it’s essentially a “set it and forget it” component. Compared to the frustration of dealing with a failing sensor, this experience has been a complete success. It has significantly outperformed my expectations based on the previous sensor’s failure.

Breaking Down the Features of Viessmann 7438702 Sensor #5, DHW Immersion Ntc

Specifications

  • The Viessmann 7438702 Sensor #5, DHW Immersion Ntc is a thermistor-type sensor specifically designed for use in Viessmann boilers. It measures the temperature of the domestic hot water.

  • It features a brass immersion well fitting for direct installation into the boiler’s DHW system. This provides a secure and watertight connection. The sensor’s Ntc (Negative Temperature Coefficient) characteristic means its resistance decreases as the temperature increases, allowing the boiler’s control unit to accurately monitor and regulate the water temperature.

Performance & Functionality

The Viessmann 7438702 Sensor #5, DHW Immersion Ntc performs its job admirably. It provides accurate temperature readings to the boiler’s control unit, enabling precise regulation of the DHW temperature. This results in consistent hot water delivery and efficient boiler operation.

The sensor excels at maintaining a stable DHW temperature, even under varying demand conditions. There are no noticeable weaknesses in its performance. It meets and exceeds expectations by restoring the boiler to its optimal operating condition.

Design & Ergonomics

The design is simple and functional, focusing on reliability and compatibility. The brass fitting ensures a secure and leak-free connection to the boiler. The sensor’s compact size allows for easy installation in tight spaces.

The Viessmann 7438702 Sensor #5, DHW Immersion Ntc is designed for professionals. There’s no real “user interface” to speak of; its function is purely technical. No real learning curve is involved for qualified installers.

Durability & Maintenance

The Viessmann 7438702 Sensor #5, DHW Immersion Ntc, being a genuine Viessmann part, is expected to last for many years. The brass construction is resistant to corrosion. Minimal maintenance is required.

In the event of failure, replacement is the only option. The design doesn’t lend itself to repair.

Accessories and Customization Options

The Viessmann 7438702 Sensor #5, DHW Immersion Ntc doesn’t come with any accessories, nor does it require any customization. It’s a direct replacement part designed to integrate seamlessly with specific Viessmann boiler models and Vitotronic controls. Compatibility with aftermarket accessories is not a relevant consideration.

Pros and Cons of Viessmann 7438702 Sensor #5, DHW Immersion Ntc

Pros

  • Genuine Viessmann part, ensuring optimal compatibility and performance.
  • Accurate temperature sensing for precise DHW control.
  • Durable construction for long-lasting reliability.
  • Straightforward installation by a qualified technician.
  • Restores boiler to efficient operation, saving energy and money.

Cons

  • Relatively expensive compared to aftermarket alternatives.
  • Requires professional installation; not a DIY project for most homeowners.


Who Should Buy Viessmann 7438702 Sensor #5, DHW Immersion Ntc?

  • Perfect for homeowners with compatible Viessmann boilers experiencing DHW temperature issues. This part is vital for those who value reliable hot water and efficient heating system performance.

  • This is essential for HVAC technicians servicing Viessmann boilers. Having this on hand can quickly resolve DHW temperature problems.

  • Homeowners looking for the cheapest possible solution might consider aftermarket sensors. Those unwilling to hire a qualified technician should also avoid this product.

  • Professional installation is a must.

Conclusion on Viessmann 7438702 Sensor #5, DHW Immersion Ntc

The Viessmann 7438702 Sensor #5, DHW Immersion Ntc is a crucial component for maintaining the proper function of your Viessmann boiler’s domestic hot water system. While it might seem like a mundane purchase, its impact on comfort and energy efficiency is significant. The price may be higher than aftermarket options, but the reliability and compatibility of a genuine Viessmann part are well worth the investment.

I would absolutely recommend this sensor to anyone experiencing DHW temperature problems with their compatible Viessmann boiler. It’s a straightforward solution that delivers reliable performance. Don’t hesitate to invest in this sensor to restore your boiler to its optimal working condition and ensure a consistent supply of hot water for your home.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top