Change regular to system boiler

[Roberto2019]

I'm getting a new boiler (oil).

Current set up is traditional vented, expansion tank in the loft etc.

I was assuming I would just replace like for like - i.e. get a new regular/heat only boiler, and leave the rest as is.

One plumber has suggested I put in a system boiler instead and ditch the expansion tank in the loft (to be replaced with a pressurised expansion vessel, I assume).

I am struggling to see what the advantage would be to this. Why change from regular to system, doesn't that just create more work?

Many thanks

 

[Exedon]

Is your system already full pumped? Ie has one or two motorised valves?

 

[fixitflav]

I'm getting a new boiler (oil).

Current set up is traditional vented, expansion tank in the loft etc.

I was assuming I would just replace like for like - i.e. get a new regular/heat only boiler, and leave the rest as is.

One plumber has suggested I put in a system boiler instead and ditch the expansion tank in the loft (to be replaced with a pressurised expansion vessel, I assume).

I am struggling to see what the advantage would be to this. Why change from regular to system, doesn't that just create more work?

Many thanks

There are pros and cons with a heat-only and system boilers. Been discussed on this forum a few times, and preference among the professionals is pretty evenly split. Personally I would replace like with like, should be cheaper.

 

[Roberto2019]

Is your system already full pumped? Ie has one or two motorised valves?

It is pumped central heating, gravity hot water - so one motorised valve only at the moment.

I was thinking adding the hot water onto the circuit with an additional MV would be simple enough?

 

[fixitflav]

It is pumped central heating, gravity hot water - so one motorised valve only at the moment.

I was thinking adding the hot water onto the circuit with an additional MV would be simple enough?

You could add another MV (on the CH circuit presumably) with system or heat-only. Heat-only likely to be less work.

 

[Exedon]

As you have gravity hot water that's probably why the suggestion to use a system boiler.
Often make conversation to fully pumped easier.
System boilers have both pump -expansion vessel and prv built in.
You can't just add a extra valve to existing gravity circuit without modifying existing open vent/ cold feed.