ᐅ New Boiler After 25 Years

Hello dear forum,

I am a complete beginner when it comes to heating technology and hope to get some helpful guidance here.
We have a Viessmann boiler, model 1601 193R.

We want to replace it. We made a small "Google" attempt to see if it’s even possible for a layperson to compare systems. Unfortunately, it’s not that easy for us.
So here are the basic requirements for the new model:
Gas
Manufacturer doesn’t matter
Hot water storage tank (or none, if you think tankless water heating is better)
Heating circuits or operating mode controllable via smartphone
Error messages accessible to the end user (not just the technician or partner) via smartphone as well
A system that is very maintenance-friendly from your point of view and has good spare parts availability

We have two floors and a living area of 155 m2 (1670 sq ft). I hope I have provided enough information to maybe get a first suggestion. What we wonder is how much “kW” output we should pay attention to, etc.

Please forgive the beginner questions. Thank you very much in advance for your help.

Best regards
Lucas

Do you have internet in your heating room?
You should base the capacity on the old system or have a heat load calculation (HLB) done, although this is not always straightforward in existing buildings.

Hello,

There will be internet available, either via Wi-Fi or wired connection.
Best regards

Oh, what does HLB mean?

Heating Load Calculation.

Ah, great, thank you very much. Has anyone already got a manufacturer or model recommendation for me?