New combi requires gas rate increase?

[Shanko]

Hi folks,

New to the forum and know nothing about plumbing so go easy on me!

Our Worcester Bosch greenstar 28i junior combi has a serious leak and we're looking to replace it with a new one. My regular plumber has recommended an Intergas boiler. I'd never heard of them before but he thinks they're great and there's seems to be other fans on here too so I'm happy to go with it. The only problem is he's saying the HRE 28/24 would require a gas pipe upgrade and he wants to install the 24/18.

The 24/18 has a DHW flow of 8 l/m at 35deg which seems like it isn't enough for our 2 bed, 1 bathroom house. Equally well I don't really want to start upgrading gas pipes when we have seemly good-sized boiler that's worked well for us (up until now!).

Other quotes we've had from different companies haven't mentioned needing to upgrade the pipework for similarly sized Worcester/Ideal boilers and I'm at a loose end with what to do.

Do Intergas boilers require a higher gas rate than their UK counterparts?

Thanks
Chris

 

[Deleted member 267285]

What is the current gas pipe size? What is the “serious” leak on? Do you have 8 litres per minute available?

 

[Shanko]

Thanks for replying. I can't remember exactly what he said was causing the leak but it's bad enough that we're having to turn the isolator on and off depending on when we need hot water in the house. The flow connecter from heat exchanger possibly? We were already planning on getting a new boiler anyway as we're redoing the bathroom.

Our shower is pretty powerful at the moment so we seem to be getting the full 11 l/m that the current boiler offers. There doesn't appear to be any pressure drop when switching between hot and cold currently.

Current pipe seems to be about 25mm in diameter.

 

[Deleted member 267285]

Sounds like it could be the flow adapter (common fault on that boiler and cheap enough to repair), but without knowing or seeing the leak can’t say for certain. I wouldn’t compromise on flow rates then if you’re getting 11lpm at the shower. Why not obtain a 2nd opinion or quote? Gas pipe will either be 22mm or 28mm, probably the former.

 

[fixitflav]

Do Intergas boilers require a higher gas rate than their UK counterparts?

I don't see why. Assuming they're both 28kW output, the efficiencies will be very similar so same gas flow.
If the gas pipe is 22mm, the length needs to be ~ 30m to give allowable pressure drop 1mb. Sounds like the guy suggesting upsize is trying to make work.

 

[Madrab]

Want to bet the Junior was installed to replace an old HO boiler and it's still got a 15mm supply on it. See it all the time.

Any reason that a 24/18 is recommended, any specialist requirements? - You'd get much better HW output with a Rapid 25 (Plus)

 

[Madrab]

Forgot to check - OP, what size is the gas pipe to the current boiler?

 

[fixitflav]

Forgot to check - OP, what size is the gas pipe to the current boiler?

I assumed the "about 25mm" in #3 was the gas pipe, so probably 22mm, but maybe that is the water pipe. From the manual, the boiler gas inlet is Rp3/4.

 

[Mr Chibs]

FWIW, I’ve got an intergas rapid+ 32kw.
Around 17m of gas pipe run, of which around 10m of this is 28mm, dropping down to 22mm.

it’s a great boiler, might be wrong but I think the hot water is around 13 litres per minute.

 

[Stadan20]

Stick with worcester , or even repair your existing one . More than likely right hand block or flow turbine adaptor . Both are easy jobs

 

[Razor900]

Unser rhe right circumstances Worcester will allow a working pressure of 16.5mbar P1 test point.

Intergas will At Risk the boiler at 18mbar. Not doing it was one of the reasons they sacked a direct labour service engineer last year

 

[DP]

Hi folks,

New to the forum and know nothing about plumbing so go easy on me!

Our Worcester Bosch greenstar 28i junior combi has a serious leak and we're looking to replace it with a new one. My regular plumber has recommended an Intergas boiler. I'd never heard of them before but he thinks they're great and there's seems to be other fans on here too so I'm happy to go with it. The only problem is he's saying the HRE 28/24 would require a gas pipe upgrade and he wants to install the 24/18.

The 24/18 has a DHW flow of 8 l/m at 35deg which seems like it isn't enough for our 2 bed, 1 bathroom house. Equally well I don't really want to start upgrading gas pipes when we have seemly good-sized boiler that's worked well for us (up until now!).

Other quotes we've had from different companies haven't mentioned needing to upgrade the pipework for similarly sized Worcester/Ideal boilers and I'm at a loose end with what to do.

Do Intergas boilers require a higher gas rate than their UK counterparts?

Thanks
Chris

Look for a guy who does repairs and servicing, not one who only instals boilers.
If as has been said already, leak stops when cold water isolated, easy peasy repair.
Carry that part as van stock

 

[DP]

Thanks for replying. I can't remember exactly what he said was causing the leak but it's bad enough that we're having to turn the isolator on and off depending on when we need hot water in the house. The flow connecter from heat exchanger possibly? We were already planning on getting a new boiler anyway as we're redoing the bathroom.

Our shower is pretty powerful at the moment so we seem to be getting the full 11 l/m that the current boiler offers. There doesn't appear to be any pressure drop when switching between hot and cold currently.

Current pipe seems to be about 25mm in diameter.

Also, do you have water meter?
If yes, then you need mini expansion vessel
If main pressure too high, look at the manual and see if boiler be needs a mini EV and PR valve
Excessive pressure could lead to secondary circuit failure

 

[bernardgreen]

Look for a guy who dies repairs and servicing,

sounds like a dead end career.