external pipework

[garyjl]

Im in the process of having a new combi boiler fitted in what used to be an on coal store
at the back of my house that currently houses our existing boiler. As we are changing to
a combi system we will need to run a supply pipe from our mains under the kitchen sink
to the boiler which will have to be run along the exterior wall of the house for about 4mtrs
along with another pipe which i presume is the hot return for our sink.

So my question is would this be a normal thing to do and if so what kind of insulation
would need to be in place to prevent the pipes freezing during the winter ?

 

[AWheating]

i would prob make up some pipe in pipe lenghts using platic barrier pipe, 25mm thick (min) high temp lagging and an outer corrigated pipe ducting with an internal size the same as the lagging.

better run in the ground than on an external wall making sure no water can get inside it.

you can buy pre insulated pipe in pipe but its expensive and normally from 25mm pipework upwards.

 

[SimonG]

Picture would be good. Is the coal house attached to the house? How are the current pipes ran?

 

[SimonG]

Is it gas or oil?

 

[garyjl]

The coal house is attached to the house.
I dont know what way the pipes are connected at the minute but the plumber
says he needs a mains feed from under the kitchen sink an the only alternative
would be to dig out the concrete kitchen floor.

 

[garyjl]

Sorry forgot to say its a gas system but the gas line is already in place from
the current system

 

[lame plumber]

not a good idea to have any external pipework, if you must bury it in the pre-insulated pipe and pay the price or you'll just be wasting money. Another thought is how long the runs are as you'll be waiting an age for hot water to arrive at some taps, again a waste of money. Another point to ensure is that the gas line isnt 15mm and is being installed in 22mm or more if required so you boiler can function at its best rate.

 

[garyjl]

Unfortunately its a solid concrete yard at the back so the pipes cant be burried underground
and would have to run across the back wall. Its isnt very far so the hot water to the kitchen
wouldnt take long to arrive but im getting a bit worried the the two pipes will freeze up
during the winter.

Has anyone every installed heating into a garage or out building before and had to keep the
pipework above ground running into the house ?

 

[SimonG]

All the time. Pipes go through wall and straight into house, then worked from there.

 

[lame plumber]

seen it done and gone back to replace it when they find themselves wasting money and freezing up. A bit of concrete isnt hard to deal with, break and bury is the best option, gonna disagree with the cow on this one.

 

[Neil K]

Break, bury at least 600mm deep and insulate as well as possible

 

[jase158]

or go straight into house and across inside the house!!!
copper with push fit for those hard to reach areas

 

[Reg Man]

The jobs not worth doing unless its done properly. Running external water mains is going to cause you nothing but aggravation and future expense. Run it internally and straight through to the boiler compartment. You will have to have all pipes insulated external or internal especially in the boiler compartment. Anything else is a fools errand, unless running the water pipe at a depth of 750mm, will probably not comply with water regulations.