Expert opinion/help badly needed

[11fernsroad]

Hello
We have a 38CDi Worcester Combi.It was just about adequate when we had 3 bedrooms and 2 bathrooms.But now with addition of 2 more bathrooms,water flow in showers are very bad if someone else uses a tap downstairs.
We have been told that Mains pressure and flow is excellent after measuring and it comes off 22mm.
We have 19 radiators with combi providing central heating(just about)
We have had few plumbers advocating combi supplying unvented indirect cylinder,while we have had few plumbers saying such a set up in unthinkable,and direct unvented cylinder is the only option.
2 others have said we need combi to supply all the radiators in house and taps in kitchen,and a seperate system for bathrooms upstairs.
Property is in Berkshire.
Any advice/opinion/tips??

 

[Best]

A combi boiler supplying taps, etc that are fairly close to the boiler and an unvented cylinder elsewhere, seems to be a good enough idea.

 

[GasmanxxxR1]

Where abouts in Berks are you

 

[Riley]

See no issue with combi heating an unvented here if your mains is up to it

 

[Masood]

As per the advice above, no reason why a combi can't heat an unvented cylinder. Just beware of total heat losses - you say the current boiler "just about" heats the house - unvented cylinder coils can have quite high heat inputs.

 

[11fernsroad]

As per the advice above, no reason why a combi can't heat an unvented cylinder. Just beware of total heat losses - you say the current boiler "just about" heats the house - unvented cylinder coils can have quite high heat inputs.

what about using Motorised valves to make combi either heating unvented cylinder or radiators?

 

[ShaunCorbs]

what about using Motorised valves to make combi either heating unvented cylinder or radiators?

need that anyway best to use 2 2 ports with a bypass

 

[Masood]

what about using Motorised valves to make combi either heating unvented cylinder or radiators?

As Shaun said, you would do that anyway otherwise you'd have the heating on in summer when you wanted hot water, and the cylinder would overheat if you ran the heating for a few hours in winter..

My concern would be that during winter months when you want the house heated as well as the cylinder, whether the boiler would cope. No reason why not, 38KW is a big boiler and not many houses have that big a heat loss figure. Get your heating engineer to do a heat loss calculation, it doesn't take that long and it's worth being sure.