Replacement gas boiler for 2-bed terrace

slopemaster

I have a 100-yr-old standard 2-up and 2-down terrace which is let out to tenants.
The boiler is old (30 yrs?) and has just failed.
I'm investigating whether it's repairable but suspect I will need to replace.

Any recommendations for a good make/model for such a property, please?
Cost is important, but don't want to buy cheap carp.
I'm looking for reliability, and preferably a long guarantee.
(State-of-the-art performance and energy efficiency are not needed.)

Current boiler is feeding 4 rads, and hot water to kitchen sink and bath.
Oddly, an electric shower has been added over the bath even tho its just next door to the boiler. (In downstairs bathroom next to kitchen cpd containing boiler.)
I don't know whether this suggests anything – insufficient flow rate? – and whether to leave well alone, or get this changed to run off the boiler.

Grateful for any comments or advice, thanks.

macman

Combi or conventional?

slopemaster

Combi. (I think)

Myser

What is the make and model of your existing boiler?

slopemaster

Sorry, I haven't a clue!

(Bought the house fairly recently, and at the moment I'm not in the same country so I can't check.)

suelizab

worcester Greenstar In my victorian terrace. combi. 2 yrs old now

katejo

Vaillant combi in my 2/3 bedroom terrace. Now about 10 years old and still working well. It is far better than the Saunier Duval in my previous flat.

slopemaster

Thanks.
I have a Vaillant combi in my other 2-bed terrace - the one I normally live in - and that seems to date from 1986 and still going strong so I suppose that's a good sign!