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Hi, just plumbed my house with the help of this forum and youtube but now I've got a niggle!

Discuss Hi, just plumbed my house with the help of this forum and youtube but now I've got a niggle! in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Took me weeks and weeks but I installed a direct hot water vented system from scratch in my house. Had never tried anything like it before but with reading posts on this forum and hours and hours of youtube videos I managed to get it up and running.. only thing is I'm worrying now I might of made a mistake.

The hot water cylinder is on the ground floor and the pipe runs up 2.4m to underneath the first floor.. I thought that the joists underneath the first floor had enough holes and notches in them already so was worried about making any new ones so what I did was route the pipes parallel to them (for about 2 m) and then up into the bathroom (just above the floor) to feed the basin and toilet. I then ran them horizontally in the bathroom for about 60cm and then back down to run them horizontally 2m in the opposite direction in between the next joists along before going up to feed the bath and then up into the loft to the cold water cistern. The cold water is all fed off the mains.

I started to worry that the hot water pipe that's vented up in the loft should have a continuous 'upflow' to the cold water cistern up in the loft. I used 22mm copper pipe throughout...

Any advice to a worried amateur would be much appreciated? I've tried searching the forum but haven't had any luck finding an answer.

Thanks
 
Draw us a pic of your design. The vent pipe should be completely uninterrupted to over the cwsc
 
IMG_20190410_235534490.jpg


I hope my plumbing is better than my drawing skills
 
Wrong I’m afraid mate. The standard way to plumb it would be horizontal (slight incline) off top of cylinder, tee, Up goes direct to loft down goes to outlets
 
So instead of dropping the hot water pipe back through the floorboard again could I just run it around the bathroom wall instead then up in to the loft instead?
 
The simple answer is that up from the tee as I mentioned before must go uninterrupted to the loft. Yours currently does not
 
I probably have it wrong but I don't think my drawing is helping much. I didn't think about the formula. There was the same type of vented cylinder in before so must admit I didn't think about that. Oh well back to the drawing board. There's a picture of the hw cylinder I was pretty sure I had that bit right at least. The lagged pipe isnt connect to the cylinder that that's the cold mains.

IMG_20190411_003222796.jpg
 
Yeah sorry not explaining it too well.. I've drawn another pic but I cant draw to save my life! I havent include the outlets to the kitchen taps or the bath.. my drawing was messy enough. The mains feed does go in at the top of the cistern, its just my bad drawing.

IMG_20190411_005512005.jpg


IMG_20190411_010442792.jpg
 
Last edited:
Yeah I've obviously routed the hot water vent pipe wrong with it going down again for a short run.. and there should be more of an angle coming off the hot water cylinder. I also checked using the formula mentioned above and that's ok.. I think the cold and feed are ok too. Now I just need to think about the best way to fix this. Probably getting a professional is a good idea ha! Although around these parts that's easier said than done, which is why I ended up trying it myself. Thanks for the replies.
 
Vent needs to rise continuously and have no outlet on it
 
Thanks for everyone's replies I really appreciate it!

So I'm wondering if I can save this by running a new vent pipe vertically from the hw cylinder, leaving the rest of the pipe work in but ending the current hot water pipe at the bath.
IMG_20190411_010442792.jpg
 
I would also put an air vent on that bit of 600mm horizontal pipework of the 'goal post'. To bleed out the air that will get trapped there and either create an air lock or at minimum it will reduce the flow through it. And swap your red handle gate valves for full bore lever type valves. nothing but trouble in the future are gate valves.
 
Darren Jackson said:
I would also put an air vent on that bit of 600mm horizontal pipework of the 'goal post'. To bleed out the air that will get trapped there and either create an air lock or at minimum it will reduce the flow through it. And swap your red handle gate valves for full bore lever type valves. nothing but trouble in the future are gate valves.
Click to expand...

Make it a manual air vent though NOT auto.
 
billions said:
Thanks for everyone's replies I really appreciate it!

So I'm wondering if I can save this by running a new vent pipe vertically from the hw cylinder, leaving the rest of the pipe work in but ending the current hot water pipe at the bath. View attachment 38126
Click to expand...

The point of the vent pipe is to take the air that accumulates in the cylinder directly up to the cistern.
From what I've seen, I'd replace the first elbow with a tee and go at least 200mm straight up with your vent pipe before embarking on the journey into the loft.
In addition, to encourage the air to go up this pipe, I'd use pulled bends or 45s (NO elbows) ALL the way up. Under NO circumcises do you go back down with it.
 
I wish some of you were local! It's impossible to get plumbers here.. that's why I ended up doing it diy in the first place... having said that there just happened to be a plumber parked on my street today so I nabbed him to have a look.

He said my pipework was well soldered and tidy, which was something I suppose, but I have to say he didn't fill me with confidence. He did say it was an issue of course but didn't seem that concerned and didn't recommend any of the things suggested on this thread. I have to say I trust what I've read on here much more.

Thank's YorkshireDave for the suggestions that seems to be the way to go.
 
YorkshireDave said:
The point of the vent pipe is to take the air that accumulates in the cylinder directly up to the cistern.
From what I've seen, I'd replace the first elbow with a tee and go at least 200mm straight up with your vent pipe before embarking on the journey into the loft.
In addition, to encourage the air to go up this pipe, I'd use pulled bends or 45s (NO elbows) ALL the way up. Under NO circumcises do you go back down with it.
Click to expand...
That seems pretty harsh to circumcise
 

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