Can you mix radiator inhibitors ?

[ianmcd]

Ian, if fitted as you suggested how can the 'temporary link' be removed without making a mess?

because the cold water inlet you simply leave the valve close and only a dribble of water will come out, the non return valve seals at the other end then just use the express connected to the filling loop hose, when connected the correct way round it makes life a lot easier as you can just drain the boiler via the 1/4 turn tap into a bucket, then inject the express and close the tap

 

[MeldrewsMate]

because the cold water inlet you simply leave the valve close and only a dribble of water will come out, the non return valve seals at the other end then just use the express connected to the filling loop hose, when connected the correct way round it makes life a lot easier as you can just drain the boiler via the 1/4 turn tap into a bucket, then inject the express and close the tap

Ian, that doesn't answer the question. If the NRV is on the cold mains supply there is nothing to stop the mains water peeing out when the flexible link is removed - as prescribed by Water Regs. The only place for the NRV is on the boiler side, stopping the boiler water escaping from the system once the flexible link has been removed.

 

[ianmcd]

Ian, that doesn't answer the question. If the NRV is on the cold mains supply there is nothing to stop the mains water peeing out when the flexible link is removed - as prescribed by Water Regs. The only place for the NRV is on the boiler side, stopping the boiler water escaping from the system once the flexible link has been removed.

This is the correct way round

 

[MeldrewsMate]

This is the correct way round

View attachment 217210

That's correct for THAT type of filling loop, with the two isolators, but that's not what the OP has, so his way is the only way for his filling loop.

 

[micpwelsh]

I'm probably totally wrong here as I'm not an expert like you guys but here goes .
Wouldn't it be a waste of money buying a magnafilter for a 15 year old boiler when it must be coming to the end of its life + most new boilers come with filter offers .

The second reason ,I'm thinking it may not be necessary as it's a Baxi 105e it's not high efficiency. New high efficiency boilers have smaller water ways in their heat exchangers requiring filters (105e certainly isn't in this category ).

Just a thought mic

 

[sxturbo]

I'm probably totally wrong here as I'm not an expert like you guys but here goes .
Wouldn't it be a waste of money buying a magnafilter for a 15 year old boiler when it must be coming to the end of its life + most new boilers come with filter offers .

The second reason ,I'm thinking it may not be necessary as it's a Baxi 105e it's not high efficiency. New high efficiency boilers have smaller water ways in their heat exchangers requiring filters (105e certainly isn't in this category ).

Just a thought mic

It will help clean up the boiler and extend its life, and if it did require replacement as some point in the future the filter will have helped clean the system and may negate the need for a power flush, so really it's a win win all round.

New heat exchanger are decidedly larger waterways because of the clogging issues and more efficient use of the heat