New Boiler - Help Please

organic_wanabe

We have decided to have a new combi boiler fitted, Our old one, a Vokera Linea Plus, has given us nothing but trouble since it was fitted 12 years ago. We have a good plumber but I just want to check that nothing has been missed! He plans to:

Drain central heating system.
Disconnect and remove old boiler.
Flush with Sentinell X300 prior to installation.
Supply and fit new Worcester Bosch 38kW CDi combi.
Supply and fit new wireless programmable time-clock.
Make good electrical supplies to new central heating system.
Install central heating inhibitor.
Install Leak Scaler in system.
Fill up system and commission boiler.
Remove rubbish and tidy site.

We have Thermostatic Radiator Valves on all our radiators apart from two, which he will fit so that all radiators can be individually controlled.

However, I am confused about a few things and don't want to keep bothering him - he probably already thinks I am an idiot!

Points that spring to mind are:

Will a Sentinell X300 flush be sufficient for boiler warranty purposes (or does it need a power flush)? My husband has read that a power flush is not a good thing and the plumber seems to agree that it could cause problems.

I have read that a system filter, magnabooser or magnaclean is a must. Is this the same as a Magnetic Sludge Remover or a good scale reducer? As you can tell, I am totally confused!

I also read that a cleanser and magnetic filter should be fitted to the return pipe work. Would that be covered by the above?

I was also wondering about asking for a Honeywell Evohome to be fitted so that I could remotely control the heating in the house as I regularly am away for home for a few days at a time and it would be good to be able to turn the heating on if the temperature drops. Has anyone any experience of using this type of thing?

Please advise a very confused damsel in distress.

southcoastrgi

Why is he putting leak sealer in the system ? That won't do your new WB any good at all, X300 is no good to clean your system, that is for brand new systems (or those upto 6 months old)

plus the rad where the room stat is shouldn't have a trv fitted

cattie

How about a water stop switch in case you ever need to turn the water off in an emergency? I had this done when my new boiler & ch was installed & think it only cost about an extra £50.

Lgas

organic_wanabe wrote: »

I have read that a system filter, magnabooser or magnaclean is a must. Is this the same as a Magnetic Sludge Remover or a good scale reducer? As you can tell, I am totally confused!

I also read that a cleanser and magnetic filter should be fitted to the return pipe work. Would that be covered by the above?

A magnetic filter collects magnetite (preventing sludge build up) and should be fitted on the return heating pipe as close to the boiler as possible. Different to a scale reducer - this is fitted on the cold supply to the boiler. A magnetic filter will work best on a clean system however, it cannot remove sludge from the bottom of rads, elbows, manifolds, and other places it likes to sit

plumbertom

Should have power flushed the system. Power flushing, is an excellent way to pre-commission clean new heating systems, to remove excess flux, swarf and other debris, and the grease and oil used to prevent rusting of components before use.
It is prudent to power flush a heating system immediately before fitting a new boiler to an existing system to prevent possible future problems. Many systems are found to contain corrosion and sludge, even if no flow problems have yet shown themselves.
Existing debris is often mobilised by alterations to the system/piping and the increased efficiency of the new boiler, and may then accumulate in the boiler heat exchanger, causing noisy operation, reduced efficiency and, in extreme circumstances, failure of the boiler. The high efficiency and compactness of modern boilers, developed to minimise fuel costs and pollution, means that they are more susceptible to problems caused by debris in the system water.