Pump over run wiring

[gas tec]

is there a heat only Boiler on the market that does not need a pump over run wiring to the boiler?

I am trawling through manufacturers instructions just to satisfy my mind as someone asked me.

 

[shaky]

Viessmann boilers are ok without pump over run and really good heat only boilers.

 

[townfanjon]

Yep as above, Viessmann compact great boiler

 

[leesparkykent]

Baxi.

 

[Harvest Fields]

The Vaillant 4 series I believe but you will need the suppressor that goes with it. But this is an add on item.

 

[Jay Jay]

Would never consider running a 3 wire set up rather than 5 wire as the flow and return sensors will be too temprmenal depending on the system, viessmann said you can't and Vaillant/glowworm energy say you can but you will get fault 83 from time to time. Not sure on baxi but never a good idea hence why apart from baxi offer it

 

[gas tec]

Ok I will have a look at the viessmann heat only cheers lads.

When googling pump over runs, with a thermal store and heat only boiler how is the pump over run controlled/timed?
I have to quote one of these, (new Boiler onto existing thermal store)and if i go with a Boiler that requires a pump over run how is this controlled so it's not just be cycling?

 

[leesparkykent]

You would use an aqua stat.

 

[king of pipes]

Ideal logics no longer need it or baxi solo cheers kop

 

[gas tec]

I just looked at veissmann heat only installation manual and it doesn't say anything about wiring with no pump over run. It don't say much about wiring at all.

 

[gas tec]

I've googled aqua stat and it don't come up with much. Is there anywhere I can find some decent instructions for this? Both fitting and wiring.
Thanks

 

[gas tec]

Ideal logics heat only manual states the pump live must be connected to the boiler.
Quote
" the boiler warranty will be invalid if not complied with"

 

[Harvest Fields]

As I said before, the Vaillant 4 series can be, but you need to fit their suppressor.

 

[Jay Jay]

Just wire the pump back it will run for a period of time, set by electronics on pcb, but don't do it on a Vaillant/glowworm as you will get f83 I promise you that

 

[Jay Jay]

Sorry I mean wire pump to Vaillant/glowworm don't take a chance

 

[king of pipes]

My mistake just checked it does need one appologies kop. Seem to remember viessman do a add on to their heat only to get over the pump over run problem will try and find it, this maybe of interest to you regards kop

 

[quality]

I don't think the Main heat only needs one