Converting from back boiler to combi

[Mick Leek]

Hello all.

At the moment i have an old BAXI back boiler that works ok but we have recently built an extension with a utility room. I aim to install a new Baxi 105he instant in the utility and pipe into original system. I have already issolated and removed the old boiler and water supplies. (corgi guy disconected and will re connect new boiler)

He told me i need to power flush the system before i commision the new boiler. (costing £400.00)

Before i disconected the old system i filled it with the de scaler (x400) or something like that and left it in the system for a week. I then drained it down and let the system re fill several times then finally totally drained it all.

I then replaced every radiator in the house and fitted each one with a TRV.

the only thing remaining of the old system are the pipes. Will this still need power flushing or am i safe to fill system and flush a few times once new boiler is ready to be fired up ??

Thanks in advance

Mick.

 

[fitz1]

If u took them out and polished them inside and out and ur new boiler conked out, manufacturer would still say its muck in the system.Best get out clause they have.

 

[Mick Leek]

Thanks for the reply.

I pay the insurance thing to british gas. You know the one where they come and fix it . The old back boiler gave up last year and they fitted a complete new gas valve or something... didnt cost me anything so will i be covered with that ?
Thanks.

Mick

 

[pierrot]

You sound as if you have an idea about what your doing, some of the larger tool and equipment hire companies have powerflushing machines,
its not to difficult.

 

[div69]

Just wondering, instead of using powerflushing equipment, can one just connect cold water to the system and flush it that way?

 

[ACOperson]

Bite the bullet and hire a powerflush machine mate, if you wanted to do it with mains water then you would need to seal the system, connect a pump to move the water around, and flush it many many times through.

Alternatively, shop around for a new boiler quote. when I install new boilers I charge only £200-£250 for a powerflush IF TAKEN AT THE TIME OF INSTALLING THE NEW BOILER. Thats not a lot more than HSs will charge for a weekend rental of a Kamco powerflush machine

 

[Nickthedentist]

Just wondering, instead of using powerflushing equipment, can one just connect cold water to the system and flush it that way?

See Chris Hutt's useful article in the FAQ section