Is Alphi-11 needed and how much?

[shedbound]

I have an open vented central heating system with an oil condensing boiler.

The boiler, (Warmflow B90), is fitted outside the kitchen wall. Therefore there is a short run of about 6 feet of outside pipework, which is lagged. The downstairs has suspended floors with pipework below.
The site is near the west coast of Wales - not very cold!

Should I add an anti-freeze / inhibitor combined, such as Alphi-11, and what would be the right quantity for a system with 11 radiators?

Thanks

 

[kevplumb]

fit a frost stat

 

[doitall]

And a pipe stat

All the pipes under the floor should be very well lagged the same as the outside ones.

 

[shedbound]

Does fitting frost and pipe stats remove need for Alphi-11 then?

Might it not just as well be added, as an inhibitor has to go in anyway?

Cheers

 

[doitall]

Good waterproof lagging for any exposed pipes is the first problem, frost stats and pipes stat are perfect in 99.9% of installations unless you get a power cut, then external pipes can suffer damage if the cut is prolonged.

Alphi-11 is a mono propylene-glycol which is corrosive to metals in the wrong quantities, so it's important to get the mixture at 25%, and contain an inhibitor for cast iron, solder, and aluminum, it's also the most expensive to produce.

 

[kevplumb]

oooooh smell err

yev been doing some searching

 

[doitall]

oooooh smell err

yev been doing some searching

No, it's in my geothermal heat pump book