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[Taxi_Driver]

So can somebody explain how any length of the pipe being 15mm is allowed....(assuming no other device is T-d off the pipe), or are we in the world of gas fitters logic 

As an example, do you think you could drink your home brew easier through a long thin straw or a pipe of the same length which was f-large for 3/4 of the run with the remaining 1/4 being the same thin straw size....

Indeed. you could run the gas main directly up to the fitting on the boiler, but if it's only 1/2 in. guess where the restriction will be...

I'd be downloading the installation manual for the boiler and checking that, TBH. Then you can get the gas fitter to explain the logic behind ignoring what it recommends. Oh, and ask him how he's going to stop the condensate drain from freezing too, if you fancy a laugh.

I did and hence the original post.....so are we saying that 15mm pipe will be ok?  as the fitting manual states 1/2in male iron for the connection...

[Taxi_Driver]

So can somebody explain how any length of the pipe being 15mm is allowed....(assuming no other device is T-d off the pipe), or are we in the world of gas fitters logic 

As an example, do you think you could drink your home brew easier through a long thin straw or a pipe of the same length which was f-large for 3/4 of the run with the remaining 1/4 being the same thin straw size....

Indeed. you could run the gas main directly up to the fitting on the boiler, but if it's only 1/2 in. guess where the restriction will be...

I'd be downloading the installation manual for the boiler and checking that, TBH. Then you can get the gas fitter to explain the logic behind ignoring what it recommends. Oh, and ask him how he's going to stop the condensate drain from freezing too, if you fancy a laugh.

He's got his work cut out there 

He's got to drill 3 holes to get the pipe outside.....one hole through the original outside wall.....then a partition wall (easy enough) then route the pipe behind the bath....and then another outside wall ...and then I'll see how he leaves the pipe once its outside....I've spare 22mm pipe lagging that i was going to put on the pipe outside if he doesnt lag it 

[Ever Ready]

The condensate drain catches many out, seen loads done, no bother in the summer but in winter pipe freezes, condensate backs up the pipe and in a couple of cases froze solid in the boiler   Switch in the condensate trap should have stopped boiler but in these cases it failed and one poor chap had a split heat exchanger

[Kevin Wood]

So can somebody explain how any length of the pipe being 15mm is allowed....(assuming no other device is T-d off the pipe), or are we in the world of gas fitters logic 

As an example, do you think you could drink your home brew easier through a long thin straw or a pipe of the same length which was f-large for 3/4 of the run with the remaining 1/4 being the same thin straw size....

Indeed. you could run the gas main directly up to the fitting on the boiler, but if it's only 1/2 in. guess where the restriction will be...

I'd be downloading the installation manual for the boiler and checking that, TBH. Then you can get the gas fitter to explain the logic behind ignoring what it recommends. Oh, and ask him how he's going to stop the condensate drain from freezing too, if you fancy a laugh.

He's got his work cut out there 

He's got to drill 3 holes to get the pipe outside.....one hole through the original outside wall.....then a partition wall (easy enough) then route the pipe behind the bath....and then another outside wall ...and then I'll see how he leaves the pipe once its outside....I've spare 22mm pipe lagging that i was going to put on the pipe outside if he doesnt lag it 

22mm pipe outside, you say? 

[Ever Ready]

Always been 21.5mm plastic pipe up my neck of the woods

Some 'tradesmen' have been known to use electricians 20mm plastic conduit

Their rational was  'well the punter won't know' and I suppose at first glance it looks similar

I blame the boiler manufacturers for making the outlet a compression fitting thereby facilitating the bodge

[Marks DTM Calib]

The condensate drain catches many out, seen loads done, no bother in the summer but in winter pipe freezes, condensate backs up the pipe and in a couple of cases froze solid in the boiler   Switch in the condensate trap should have stopped boiler but in these cases it failed and one poor chap had a split heat exchanger

In reality it highlights the incompitence of to many in the profession 

Worse still, 'gas safe', the government AND the boiler manufacturers all give guidence on how to do it.....but still, they continue to prove incompitence 

Hang on a minute, Gas Safe is supposed to be a method for proving compitence.....its any oxymoron!

[Marks DTM Calib]

He's got his work cut out there 

He's got to drill 3 holes to get the pipe outside.....one hole through the original outside wall.....then a partition wall (easy enough) then route the pipe behind the bath....and then another outside wall ...and then I'll see how he leaves the pipe once its outside....I've spare 22mm pipe lagging that i was going to put on the pipe outside if he doesnt lag it 

Er....so why dont they T into the foul waste at the bath therefore avoiding the need to go outside and eliminating the possibility that the pipe might freeze.....

[Ever Ready]

He's got his work cut out there 

He's got to drill 3 holes to get the pipe outside.....one hole through the original outside wall.....then a partition wall (easy enough) then route the pipe behind the bath....and then another outside wall ...and then I'll see how he leaves the pipe once its outside....I've spare 22mm pipe lagging that i was going to put on the pipe outside if he doesnt lag it 

Er....so why dont they T into the foul waste at the bath therefore avoiding the need to go outside and eliminating the possibility that the pipe might freeze.....

Don't be silly now Marks that's far too straight forward and sensible

Incidentally that is how mine is done

[Ever Ready]

The condensate drain catches many out, seen loads done, no bother in the summer but in winter pipe freezes, condensate backs up the pipe and in a couple of cases froze solid in the boiler   Switch in the condensate trap should have stopped boiler but in these cases it failed and one poor chap had a split heat exchanger

In reality it highlights the incompitence of to many in the profession 

Worse still, 'gas safe', the government AND the boiler manufacturers all give guidence on how to do it.....but still, they continue to prove incompitence 

Hang on a minute, Gas Safe is supposed to be a method for proving compitence.....its any oxymoron!

You'll get no argument from me re many 'professionals' competence

You can give them all the guidance, manuals etc in the world but they will do it their way because they know best

A lot of them follow the '' Monkey see Monkey do'' school of thought unfortunately   

Even worse are the ones that only fit say combis or worse only a specific make of boiler and justify there ignorance by the old maxim of ''Well it works on a Bosch, Potterton, Ideal etc

How I love my fellow professionals (used in the very loosest sense of the word)

[Sir Tigger KC]

Check out the warranty periods on new boilers TD, as some of the manufacturers are offering 5, 7, and 10 years! 

Of course there will be T&C's like regular servicing and maintenance, but worth looking at. 

http://warranty.baxi.co.uk/

[Shackeng]

He's got his work cut out there 

He's got to drill 3 holes to get the pipe outside.....one hole through the original outside wall.....then a partition wall (easy enough) then route the pipe behind the bath....and then another outside wall ...and then I'll see how he leaves the pipe once its outside....I've spare 22mm pipe lagging that i was going to put on the pipe outside if he doesnt lag it 

Er....so why dont they T into the foul waste at the bath therefore avoiding the need to go outside and eliminating the possibility that the pipe might freeze.....

Don't be silly now Marks that's far too straight forward and sensible

Incidentally that is how mine is done

Mine too into a sink waste, but I have been told it is not allowed, something to do with acids in the condensate.
I have had a Viessmann Vitodens 200 for 5 years, it appears to be a very good boiler, with a ten year warranty IF serviced annually by a Viessmann qualified plumber. (Trying to find one can be tricky!) But read the warranty restrictions, for example, not allowed to use leak sealer.

[Kevin Wood]

Mine too into a sink waste, but I have been told it is not allowed, something to do with acids in the condensate.

It has to go into a foul sewer as opposed to a rainwater drain / soakaway for this reason, but I fail to see how this prohibits connection to a sink, since that will have to go to the foul sewer anyway. More "gas fitter logic"? 

[Marks DTM Calib]

Mine too into a sink waste, but I have been told it is not allowed, something to do with acids in the condensate.

It has to go into a foul sewer as opposed to a rainwater drain / soakaway for this reason, but I fail to see how this prohibits connection to a sink, since that will have to go to the foul sewer anyway. More "gas fitter logic"? 

Yes, more gas fitters 'anti logic', fully permitable install, they can connect in as per a dishwasher waste 

In fact its a great method of instal as it means you also get you air break included without a tun dish and the acid helps keep the drain clear