Advice on a good boiler

[Blackcatgas]

i'd still like to learn about explosive mixtures - anyone else care to enlighten me ?

Mee too !I didnt dare ask about them incase it was somthing that "as a rgi you should know that as its basic stuff get the hell of here ete etc"
Iam sur that I was told that you can upsize the pipe., and even run 2 pipes together say 2 22mms side by side and then even join them at the end in a loop. sort of a "gas ring main" for want of a better discription

 

[ceedy]

Just found I can get a Biasi Riva advance 24HE ? , combi , so not my 1st choice but still from Screwfix via my daughter in law's discount card with 20-25% off . so about 450 quids ?? any good.

Calcs suggest about 17-19 kw needed so my old housewarmer was about right @ 19 kw.ish.

Chris

 

[Blackcatgas]

Just found I can get a Biasi Riva advance 24HE ? , combi , so not my 1st choice but still from Screwfix via my daughter in law's discount card with 20-25% off . so about 450 quids ?? any good.

Calcs suggest about 17-19 kw needed so my old housewarmer was about right @ 19 kw.ish.

Chris

With the £500 youve saved over buying a Vaillant, Viessmann or Worcester you can buy another one when it packs up after 3yrs.
24kw will cover your heating but will give you poor hot water flow rate.

Viessmann Vitodens 100/200 series 30kw.
Vaillant 831 ecotec (31 kw)
Worcester 30 CD1 (30kw).

 

[WHPES]

As an engineer the only reason I can think of against going from narrower pipe to wider for gas is turbulence at the junction. You will only get an explosion if you have an explosive mixture (i.e. gas plus oxidising agent). You won't actually achieve any benefit by increasing diameter after narrower pipe.

 

[doitmyself]

You won't actually achieve any benefit by increasing diameter after narrower pipe.

I would have thought that the pressure drop would be lower with the larger diameter pipe.

 

[ceedy]

Still looking 😉.

As we have a large inglenook fireplace with the Housewamer and fire in place , been looking at the baxi condensing back boiler, seems it might work on the existing gas feed?, but will need a whole new concentric flue line put in.but no major pipework changes , compared to new gas feed and boiler /tank moved upstairs to another room.

Not that happy though with the baxi electric fire fronts they offer , would rather have a stand alone flueless gas fire instead , running off the gas feed ?.

any comments ? .. no too much laughing ?!! 😀

Chris

PS. was looking at Keston ? , just cos they seemed different ,but they seem to have a bad press generally?

 

[WHPES]

I would have thought that the pressure drop would be lower with the larger diameter pipe.

Dynamic pressure (pressure when gas is flowing) is dependent on the section with the greatest friction (usually the narrowest). The wider the pipe diameter, the less the friction.

 

[evsy01]

quote ;;;;;;;;;;;However some boilers to look at are

Worchester,vaillant,advanta,baxi,even stick the ideal classic he in there as old system ,only 'B' efficiency though.


why do i never hear any one mention vokera as a good boiler ....
what do you think of that make of boiler ?

varuka's are not a gd boiler stay well clear! only get 1 if u want some free golf clubs from plumb center

 

[Billy Bob Bob]

definite no no, risk of explosive mixture occuring.

wtf??????????????????????????????????????????????????????????????????????????were did you dream that one up??????????????????????????????????????????

...........and don't touch Potterton with a bargepole - pile of c**p

dont put the performas in that category they are not the same as the hundred odd i have fitted testify

 

[Puddle]

Still looking 😉.



PS. was looking at Keston ? , just cos they seemed different ,but they seem to have a bad press generally?

Biasi Riva advance 24HE

working on above ideas how about a

ideal isar 🙁

the potterton performer/mains as proved to be a very reliable boiler as said,good purchase price,good to work on,parts reasonable,band 'B' though


imho

 

[pauls]

when you say cant go up in size on gas ive seen a small length of 22mm coming off meter and then going up to 28mm

 

[migoplumber]

as said above, not technically correct, but does decrease pipe friction.

still waiting for an answer as to explosiveness ?!

 

[gakmonkey]

when you say cant go up in size on gas ive seen a small length of 22mm coming off meter and then going up to 28mm

to be fair I have seen a trv on the gas supply to a radiant fire, but it does not make it correct. does no one use 28mm meter unions?

 

[ceedy]

Still not decided yet ??..

But have done all the prep work for the new Pipe feed to the new location in the upstairs cupboard, ripped down new coving cut grooves in walls etc .at least the boiler will be much closer to the main feed/return pipe runs to the Rads, but further from the tank .
The new gas line will be 8.6 metres with 4 or 5 ..90 degree bends ..

But before we go any further, is there any point in going above 22mm ?

I'm getting all the supplies in then getting a goalkeeper to install it all..😀
My number one son runs the local footy team and the goalie is a Corgi! 😉.

If I can get hold of him , a bit busy will confer with him on this , but its alway better to get lots of Opinions.. oops .. info !! 😀

Chris

---------------------------------------------

I'm thinking a Remada Avanti 24 or 30 System Bolier is the one .. a teeny bit more costly, but longer warranty than most .,?

Seem a reasonable choice ??? then I can chuck the roof tanks etc .. and have more access up there, for more junk 😀

C.

 

[prs1]

sometimes you just dont have any option but too upsize to obtain correct gas flow rates.Yes i know it not best practise but theres times when cost and what is resonably practicable.
I had to do this on an install of a 33kw he combi on a long run,but could not accsess the first 8ft from meter,custard dint want an external run on her 275,000 pound house and she didnt want me chisleing her dining room wall out.
It was were GSR Probationary visit came to and he was quite happy that it was the resonable thing to do after checking the calcs for sizing.
No mention of explosive mixtures though other than the usual 5 to 15 % if i remember right.

 

[ceedy]

Well done the chiseling of the dining room already ,,😀
And I'm not have an external draped around my nicely point hamstone
either😀 anyhow that would be over 20 meters .😱

22mm will fit in all the places round/through the beams, but 28mm will be a bit tight with no room for wrapping.

so 22mm it is then , can still use the old 15 mm back boiler feed for a standalone fire in the inglenook.

Chris.

 

[Billy Bob Bob]

pipe sizeing is a pain in the axxe l worst run i ever did was 50 ft of 1.1/4 then to inch then 22mm, 2 x 24 kw combis in a pub calcs for 48kw

 

[moony]

as said above, not technically correct, but does decrease pipe friction.

still waiting for an answer as to explosiveness ?!

your not going to get one cos its a load of **** lol

has to be a mixture of gas and air in pipe for explosive reaction - its not going to happen unless the gas valve sucks air in - even then it wouldnt be no where near enough to be explosive as he said

 

[Billy Bob Bob]

thats what i said q, lol? i pixxed my self when i read that

 

[migoplumber]

ceedy, good boiler choice - no need to go above that for any normal domestic situation.
gasman 😎