Moving Hot water tank

Gerry1995

I will be moving my hotwater tank to a more suitable location shortly, however I do not intend moving the cold water tank in the attic. My question is can the expansion pipe from the hot tank run for 12/13 meters ?

items

No matter how far away cylinder is located its still the same as tank directly above cylinder if you get me. Cylinder is open vented meaning open to atmosphere, water in cylinder will still travel all way back up vent until it reaches water level, can be 1 mtr or 15 mtr its still the same. Safety end of things is not really sacrificed by moving cylinder further away but you'll be sacrificing some efficiently, there will be a bit more water in vent pipe which might soak up some of the cylinders stored heat. This is the main reason why cylinders are located as close to tank as possible, its always best practice.

Their might be some regulation towards maximum distance of vent but I don't have any figures from memory I'd have to look it up as its never been much of a concern, I've always vented fitted cylinder as close to tank as possible. One thing I know, vent must be copper and always rising.

Gerry1995

Thanks, Item. This is a country cottage I am doing up. The hot tank is in the sittingroom under the cold tank, as usual, however I want to move the hot tank to a bedroom but I didn't really want to move the cold tank. Also I will leave the CH expansion tank with the main cold tank as I the feed to the CH I believe should be close to where the circulating pump is located. If I do move the hot tank the pipe will rise all along it's run.

Gerry1995

Just getting around to actuially doing this work now. If I were to put in a seperate cistern in the attic at the correct height to vent the hot water cylinder and just let any water which may be vented run out of it to the outside, would that be acceptable. This would have the effect of reducing the lenght of the vent pipe run to a more usual 8/10 feet.

sullzz

The water level in the vent pipe is going to settle at the same level as the water in the tank the feed to the cylinder is fed from so if you are punning in a dummy tank it would want to be at at least the same height as the existing tank .
If you are able to fit a dummy tank above the cylinder in the new position why can't you connect a mains supply to it and drop a cold feed to the cylinder from it .

Gerry1995

As i mentioned I do not want to have to move the main cold water storage tank and this is normally the feed to the cold taps, toilet and shower in the bathroom as well as the cold feed to the hotwater cylinder. To just add a cold feed tp a dummy tank would introduce a third cold feed tank and that would seem to be getting more unusual and more unnecessary plumbing as I have a satisfactory cold feed to the hotwater cylinder. I just want a handy and acceptable way of venting, when necessary without the long vent pipe run.

Joey the lips

sullzz wrote: »

The water level in the vent pipe is going to settle at the same level as the water in the tank the feed to the cylinder is fed from so if you are punning in a dummy tank it would want to be at at least the same height as the existing tank .
If you are able to fit a dummy tank above the cylinder in the new position why can't you connect a mains supply to it and drop a cold feed to the cylinder from it .

Are you suggesting he fills the copper tank with a mains supply?

or are you suggesting he uses a smaller tank to fill the copper cistern?

I suspect you are suggesting the second. The reson this is not do it can mean the ball cock a nusance and additionally the expansion of the hot water cylinder must run into this and it will cause its temp to rise rapidly. As far as i know this is illegal because of legonaires.

Mains is also illegal.

sullzz

Joey the lips wrote: »

I suspect you are suggesting the second. The reson this is not do it can mean the ball cock a nusance

I have no idea what you are trying to say.

I'm not saying connect the cylinder onto the mains.
Everything else in your post is unclear , I can not make out what your saying at all.