New Viessmann Vitodens 100 Series - B1HE

Alan (California Radiant) Forbes

Their new 100 series of boilers has just become available here and Viessmann promotes them as their workhorse model for systems that have single temperature heating systems with or without DHW. Their new 200 series will handle multiple temperature systems with mixing valves.

Now comes with WiFi along with a very nice touchscreen control, "lightguide" illumination, an integral primary pump, a second set of supply and returns for DHW and a diverting valve to cycle between DHW and heating.

We replaced this Triangle Tube Prestige Solo 110.

heathead

Except for the multi temp zones. What else does the 200 add. Thanks

Alan (California Radiant) Forbes

@heathead It may just be that it can deal with multi-temp zones and that's it, but I haven't put my hands on one yet.

One other thing: The new boilers require a heat demand from an end switch to turn on where previous models would default to turning on when the outdoor temperature dropped below WWSD when an end switch wasn't connected. The boiler would turn on even if there was no call for heat, typically heating up the LLH and no further.

Derheatmeister

I have not read the Venting Instructions for this boiler yet...IS the Concentric PVC exhaust approved for the Viessmann ? ?

TAG

Derheatmeister said:

I have not read the Venting Instructions for this boiler yet...IS the Concentric PVC exhaust approved for the Viessmann ? ?

When mine was done last year the guys had to rip it all out and use that gray stuff that was approved

Alan (California Radiant) Forbes

PVC is not allowed for the exhaust. I used the existing PVC concentric flue termination because it's only a short segment and I didn't think it would leach enough chlorine to damage the HX.

Derheatmeister

It is probably going to be fine...Especially if you have low exhaust gas temperatures..