Frost stat for Vaillant Ecotec pro 28 combi

[ST1300]

Hi Guys,

I have a combi Vaillant Ecotec pro 28 boiler in my kitchen. I have just added a rad in my garage and have been advised to add a Honeywell frost stat in the garage to be wired up to the boiler. I have also been advised to add a pipe stat to be wired in series to the frost stat but also been advised not to bother with a pipe stat as its a waste of time......

My pipes are all lagged.

Can I have your thoughts please and what connections do the 1+3 go to on the boiler ?

Thanks
Joe

 

[ShaunCorbs]

Gas safe eng needed as cover needs to come off

 

[Dotty]

As above, this is not a diy job