Boiler Filling Loop

sparkymark75 · 5 Feb 2015 at 15:41

I'm looking for a flexible hose with a 22mm screw connection at one end and 15mm at the other. I can't seem to find one anywhere, do these actually exist?

Basically one of these: http://www.screwfix.com/p/wras-hose-22mm-x-15mm-x-500mm-x-10mm/40166

with the same fittings on the end as this: http://www.screwfix.com/p/wras-hose-1-2in-x-1-2in-x-500mm-x-10mm/82014

If it helps any, it's a filling loop for a boiler. For some reason known only to the person that fitted it, there was a washing machine type hose connected to a stop valve on the cold water mains (22mm) which went to another valve (15mm) on the pipework going into the boiler.

The plastic insert in the screw fitting on the 15mm broke last night so I was looking for a replacement. Seems most filler loops are 15mm to 15mm.

Failing that, do you get a 22mm male to 15mm female reducer?

Russinating · 5 Feb 2015 at 16:00

Sorry, just to confirm, what does the cold water come in as (as a pipe), 15mm or 22mm? Or does one of the valves change it up to 22mm?

sparkymark75 · 5 Feb 2015 at 16:04

Russinating said:
Sorry, just to confirm, what does the cold water come in as (as a pipe), 15mm or 22mm? Or does one of the valves change it up to 22mm?

I'd need to check this when I get home but I'm assuming at this stage that the cold water pipes are 22mm as the valve on the cold water feed appears to be just a stop valve.

Russinating · 5 Feb 2015 at 16:09

So it currently goes pipe (22mm) -> stop valve (22mm) -> straight coupler/valve (22mm -> 15mm) -> pipe to boiler (15mm)?

sparkymark75 · 5 Feb 2015 at 16:10

Russinating said:
So it currently goes pipe (22mm) -> stop valve (22mm) -> straight coupler/valve (22mm -> 15mm) -> pipe to boiler (15mm)?

The part in bold yes, the bit at the start I'd need to check.

Russinating · 5 Feb 2015 at 16:42

I'm no tradesman but it's unlikely the stop valve is also a reducer so I would assume the incoming pipe is 22mm as well (otherwise you'd just stick a 15mm stop valve on and be rid of the reducer further along, though I've seen crazier configs).

Could you post a photo when you're home?

sparkymark75 · 5 Feb 2015 at 16:43

Russinating said:
I'm no tradesman but it's unlikely the stop valve is also a reducer so I would assume the incoming pipe is 22mm as well (otherwise you'd just stick a 15mm stop valve on and be rid of the reducer further along, though I've seen crazier configs).

Could you post a photo when you're home?

Sure, thanks.

sparkymark75 · 5 Feb 2015 at 18:25

Pics as requested.

Pic 1: http://i.imgur.com/v6a9Hz9.jpg

Pic 2: http://i.imgur.com/SCb5eaJ.jpg

Bickaxe · 5 Feb 2015 at 19:17

I'd put a reducer on the 22mm pipe and then the flexible pipe/stop valve thingy

sparkymark75 · 5 Feb 2015 at 19:32

Bickaxe said:
I'd put a reducer on the 22mm pipe and then the flexible pipe/stop valve thingy

Something like this?

http://www.screwfix.com/p/reducing-coupler-compression-fitting-15-22mm/68500

Russinating · 5 Feb 2015 at 19:33

As above.

This: http://www.screwfix.com/p/female-coupler-22mm-x/89654
And this that you linked to: http://www.screwfix.com/p/wras-hose-1-2in-x-1-2in-x-500mm-x-10mm/82014
And some: http://www.screwfix.com/p/ptfe-tape-each/76841

Will do the job.

Bickaxe · 5 Feb 2015 at 19:36

Try one of these
http://www.plumbcenter.co.uk/en/heating/bulldog-combi---boiler-filling-loop-15-mm/

sparkymark75 · 5 Feb 2015 at 19:52

Russinating said:
As above.

This: http://www.screwfix.com/p/female-coupler-22mm-x/89654
And this that you linked to: http://www.screwfix.com/p/wras-hose-1-2in-x-1-2in-x-500mm-x-10mm/82014
And some: http://www.screwfix.com/p/ptfe-tape-each/76841

Will do the job.

Thanks. Will 1/2" fit on a 15mm threaded end?

FlyingFish · 5 Feb 2015 at 20:00

Proper job, buy and fit this: http://www.screwfix.com/p/equal-tee-filling-loop/67366

Or

To link the fittings you have with a hose then buy this: http://www.screwfix.com/p/flexible-tap-connector-15mm-x-x-300mm/77154

And use a little stub of 15mm pipe, 15mm olive & nut to connect the hose to your non return valve

Mick

sparkymark75 · 5 Feb 2015 at 20:04

I was going to buy

http://www.screwfix.com/p/combi-straight-filling-loop/46605

and

http://www.screwfix.com/p/reducing-coupler-compression-fitting-15-22mm/68500

FlyingFish · 5 Feb 2015 at 20:17

Won't work, the end of your cold mains filling tee is 3/4 that's why you need to use the hose I quoted above.

For the sake of turning your water off, and undoing two nuts, you might as well fit the equal tee filling loop I quoted above. You don't have to use the new non return valve, as that would require draining the heating.

sparkymark75 · 5 Feb 2015 at 20:39

The reason I thought the mains end was 22mm was because it was a washing machine type hose that was connected to it and it looks to have a 22mm plastic "bolt" on it.

FlyingFish · 5 Feb 2015 at 20:48

The hose I quoted above will screw straight onto your existing valve, and be water right as it has a rubber seal inside the nut, you just need a bit of pipe, nut & olive, and job done.

sparkymark75 · 5 Feb 2015 at 21:07

Ok, I'll give that a go once I find a bit of copper pipe.