ViessTech Engineering Blog

Blog · Monday 29th of June 2026 · by Elisa Nordberg

What Type of Fan Should You Use for Emergency HVAC Replacement? (I Learned the Hard Way)

A direct, experienced guide from an emergency HVAC specialist on selecting axial fans, duct fans, tangential fans, plug fans, and backward curved centrifugal fans for urgent commercial projects. [...]

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Blog · Friday 26th of June 2026 · by Elisa Nordberg

How to Bleed a Radiator the Right Way: A Facility Manager’s Practical Checklist

A step-by-step checklist for facility managers and maintenance staff on how to bleed a radiator properly, including common mistakes, cost-saving tips, and when to call in a professional. [...]

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Blog · Friday 26th of June 2026 · by Elisa Nordberg

Why I Now Pay a Premium for Certainty: An Admin Buyer's Take on the Boiler vs. Heat Pump Dilemma

An admin buyer shares a hard-won lesson from a 2023 vendor failure, comparing Viessmann and budget options for commercial heating, and explains why paying for certainty (like a 10kW Vitocal 250-A) is often the cheaper choice in the long run. [...]

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Blog · Thursday 25th of June 2026 · by Elisa Nordberg

I Nearly Cost My Client £18,000 on a Viessmann Boiler Warranty: What I Learned About 'Lifetime' Cover

A quality manager's story about a commercial retrofit project, revealing the common misunderstandings around Viessmann boiler warranties and the real cost of assumptions. [...]

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Blog · Thursday 25th of June 2026 · by Elisa Nordberg

The 6-Step Viessmann System Boiler 35kW Installation Checklist: What the Manual Doesn't Tell You

A practical, step-by-step checklist for installers and engineers fitting a Viessmann 35kW system boiler. Based on real-world experience, covering what the manual misses and the five-minute checks that save days of rework. [...]

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Blog · Wednesday 24th of June 2026 · by Elisa Nordberg

The Hidden Cost of Ignoring Your Viessmann Boiler's F4 Error Code (And Why Part 7819627 Matters)

A procurement manager's deep dive into Viessmann boiler F4 error, the overlooked role of heating part 7819627, and why small clients deserve fair treatment—with lessons from managing air compressors, kerosene heaters, and cooling systems. [...]

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Blog · Wednesday 24th of June 2026 · by Elisa Nordberg

The Real Cost of Upgrading to a Viessmann Heat Pump: A TCO Breakdown for Facilities Managers

A procurement manager's guide to calculating the true total cost of ownership (TCO) for Viessmann heat pumps vs. gas boiler replacements. Three common scenarios, real numbers, and where most buyers miss the hidden costs. [...]

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Blog · Tuesday 23rd of June 2026 · by Elisa Nordberg

Viessmann Boiler Service: A 5‑Step Checklist That Saved Me $1,200 in Repairs (Plus Garage Heater & Filter Mistakes)

A practical, step‑by‑step checklist for servicing a Viessmann Vitodens 100‑W combi boiler, with common pitfalls during garage heater maintenance and tips on how to clean K&N air filters using a Milwaukee air compressor. [...]

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Blog · Tuesday 23rd of June 2026 · by Elisa Nordberg

Why I Say Stop Guessing On Viessmann Parts (And Start Buying Right)

A hands-on perspective from an office administrator who learned the hard way: buying Viessmann heating parts like the 7826514 air filter without understanding the system costs more than money. This is why customer education matters, not just price comparison. [...]

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Blog · Monday 22nd of June 2026 · by Elisa Nordberg

Viessmann Boiler Parts, Repairs & Common Questions: A Field Guide for Installers

Straight answers about Viessmann boilers, from finding parts to troubleshooting the 100 Combi, written by a specialist who handles emergency call-outs daily. [...]

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