Boiler choices - any advice?

[Sleepthief]

We're about to replace our vintage Ideal boiler and want to make the right choice, so would really appreciate from anyone who knows anything about boilers/heating systems (which we absolutely don't and are so clueless the salesmen could tell us anything and we'd have no choice but to believe ).

Our plumber, who has done several jobs in the past for us and we believe to be very good, has recommended a standard combi boiler (probably Worcester Bosch), but increasing the size of the pipes to the mains to increase the amount of water to the house. Obviously this will increase the cost, so we would like an objective idea of whether it's worth it or not.

We are a family of five in a four-bed 1930s house with a main bathroom and a shower room/toilet. We also hope at some point in the next 5-10 years to convert the attic into a bedroom with ensuite.

Would you put the money into the ground to get the extra pressure/water flow? Any advice would be most gratefully received. Thanks :)

Worcester Bosch greenstar.

Thanks. Thats the boiler of choice, but is it worth putting money into the ground to increase the size of the mains connection?

Probably not unless your water pressure is currently very low.

We replaced our equally ancient boiler when we moved in (4 bed 30s semi) with a Vaillant boiler and Megaflow cylinder. We replaced the water main from the meter up to the new boiler (in the event for various reasons - read on). Had option to increase size of pipe into house to increase rate cylinder refills as work we've done won't affect this, but were told we could do it at later date if necessary (guy that did our system had same set up as we want eventually and didn't think it was necessary). Told us it would cost about £500 to do this.
We have a family bathroom (bath and shower) and a shower room at the moment and will be putting another shower room in in the next couple of years. Hate electric showers for various reasons so wanted them all off the tank. Hot water takes 15 minutes to heat up from having none so that's not really an issue. Tank really well insulated so stays warm for ages (if anything the tank is too big for us now), but in 10 years we could have 3 teenagers... Water pressure now fantastic (difference is huge). Showers like those you get in hotels.
Well pleased with our choice - though week it was done was horrendous (knackered old system, leaky old water main, waterfall through kitchen ceiling at one point ......!)

I would ask on this forum: www.diynot.com/forums/viewforum.php?f=7
Athough it's ostensibly a DIY forum there are a number of professional heating engineers on there who I'm sure would be pleased to help.

That's great, thanks. Megaflop was another option. Will also check out that forum. Thanks again.