Piping upgrade

[davlins]

Keen to get advice and opinion from the experts.
We currently have a 20yr old Gloworm Swiftflow combo which has served our 4 bed/ 17 radiator house very well. We want to replace it for 2 reasons - it is increasingly difficult to restart the pilot light on return from our 2 month absences and also we will be downsizing in a couple of years time and will need to replace for sale purposes.
We have had a good number of approved gassafe installers round and we had decided to go for a half decent boiler rather than a valliant or Worcester bosch- so we opted for the ideal logic 35plus. However we had a guy round tonight who said we didn't need a 35kw model and a 31 kw was more than needed and he could do a great deal on a valliant model which would be a bit more expensive but offered a 10 year guarantee against the 7 given by Ideal.
However he also mentioned the likely need to upgrade the piping from 22mm to 28mm. He is the first person to mention this but once he mentioned it I did think of the distance our Meyer is from the boiler - approx 15 metres.
Our needs revolve around 1 power shower/ 5ring gas hob and oven and as said we have 17 radiators.
So any advice/ opinions re all of the above would be appreciated.

 

[hammers4spanner]

Exactly how many gas safe installers have you had come out to price this job?

 

[josh]

Why not take advice from the expert you'v had in your house as opposed to strangers on the internet, use the man/lady you feel comfortable with and comes with a recommendation from friends/family, check he is registered with gas safe and that you have agreed on a price before you hire him.

 

[ShaunCorbs]

yes you will have to upgrade the gas pipe depending on the run of it

 

[Dotty]

Sounds like he's the one you should be trusting.

 

[davlins]

Exactly how many gas safe installers have you had come out to price this job?

4 supply and fit quotes in Dec 2014 and installation

date agreed with 1.Due to unfortunate circumstances installer didn't manage to keep appt and as we were going abroad things were left until we returned this month. We have since had 3 quotes for installation only.

 

[davlins]

Why not take advice from the expert you'v had in your house as opposed to strangers on the internet, use the man/lady you feel comfortable with and comes with a recommendation from friends/family, check he is registered with gas safe and that you have agreed on a price before you hire him.

I am assuming that some of the strangers on the internet you refer to are indeed gassafe registered installers?
We have had 7 supposed experts giving advice and quotes - very varied and often conflicting may I add.

 

[stevetheplumber]

i5m run with a 5 ring cooker will probably need a bit of 28 adding

 

[kris]

I'd stick to the first manufacturer u said. Ideal. But an ideal vogue with 10 year warranty. Your best going slightly bigger for the hot water demand as the vogue have a super efficiency condensing mode so it will modulate down as with the demand . Defo 28mm gas pipe upgrade so he's th only one talking sense .

 

[newcastle phill]

Also you have 17 radiators. Are they bigguns ???.
Depending on the model you may need an additional expansion vessel if the system water volume exceeds the maximum for the boiler.

Some are 100 litres (ish) maximum.
If not done or calculated you risk the system blowing off excess water pressure through the integral safety valve

 

[AWheating]

I would think your gas pipe work will need upgrading from what's been said. I normally expect to have to upgrade if gas meters more than 10m away from a combination boiler. If you have had an engineer suggesting this is the case then go with him/her over others.