circulator pump question for Vitodens 200

veissman_Bob

From what I can tell, the vitodens 200 uses 3 pumps - a boiler pump, an indirect water heater pump, and a zone circulator pump.  What types of pumps would you recommend for each of these?  I'm considering between a Wilo and a Grundfos Alpha variable speed pump for zone circulator (four zones with zone control valves) because I think this will adjust the output as needed and save me some electricity cost.  But I'm not sure if it's worth spending extrac money on a variable speed pump for the boiler pump or the indirect water heater pump since I think these won't run nearly as often as the heating zone pump.



So which pump would you recommend for the heating zones, and would you use this same pump in the other areas??

icesailor

Pumps for Vitodens:

I use Wilo pumps.  I use Wilo "Star" 3 speeds for boiler, indirect and zone circulators. If I do the zones with zone valves, I use a variable speed pump. It works for me. I'm not an expert here. Someone else may say something else. That's just what works for me.

I started using Wilo pumps as soon as I realized that you can't use those disgusting red rubber gaskets that aren't supposed to be used with square cut O-rings. They use big fat wide gaskets that won't leak.

croydoncorgi

Be careful here!

Maybe a case of '2 nations divided by common language' or maybe the Vitodens 200 (US) spec you have is different.



However....



In UK there is some unfortunate history with the inbuilt 'shunt' pump installed with the Vitodens 200 range.  I believe Viessmann has now changed to another brand (not Wilo) due to problems with the modulating pump they originally used on that boiler.



(Note that in UK / Europe quite a lot of boilers (known as 'system' boilers) come with a pump (often already installed inside the casing) which is in fact large enough to meet the whole demand for pump capacity for boiler and the building.)



In the particular case of the Vitodens 200 (UK spec) you CANNOT fit a non-Viessmann-supplied part as the 'primary' boiler pump because it needs a specific (Ebus) control interface to connect to the boiler.  Does NOT have any external control or power supply.

Robert O'Brien

The new USA 200

does not have an integral system pump,the previous model did,a 220V Wilo

Robert O'Brien

Croydon

What is the lifespan of a wall mount condensing boiler in the UK?

CMadatMe

Simple

Boiler and Domesitc Pumps

WB2B-19,25,35  Grundfoss UPS15-58 3 Speed, Taco OOR or Wilo Star S 21X

WB2B-45,60,80,105 Grundfoss UPS26-99 3-Speed on speed 2.

System Pump - Properly sized pump (Grundfoss Alpha) until the Bumble Bee comes out..Have a BETA model running 6.5gpm using 2 watts.....

veissman_Bob

Thank You!

Any idea when the Bumble Bee will be released??  Would love to use that if it's not too far off.....

SpeyFitter

Head loss (Bumble Bee)

6.5 GPM at 2 watts - with what kind of head loss?

CMadatMe

Head Loss

It's a state secret. No more then 7'..