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Sorry - I'm a DIYer, so can't comment on the installation cost. Using a Megaflow is certainly one solution to the issue of a household with high hot water demands and should enable you to run two showers at once. Just make sure you're clear in your own mind about the types of shower that...

An electric shower connects to your mains cold supply and heats the water, so no - you won't be able to use an electric shower with a Megaflow. As the water from a Megaflow will be heated and pressurised, you'll need a thermostatic shower mixer, which will mix the supply from the Megaflow...

That's a fairly typical set-up for a bathroom extractor. The only way you're going to get a more powerful airflow is with a more powerful fan - I wouldn't have thought that changing the ducting would make much difference.

For reference, I live in a 4-bedroom detached house with 15 radiators and my WB 37CDi combi puts out 9.8 - 30kW to the CH. I can't remember the exact figure, but the total required to heat all the radiators was somewhere around the 20kW region. The total figure for your house will...

There are plenty of other reasons why your rads might not be getting up to temperature. Has your current boiler ever succeeded in getting all your radiators piping hot ? If it's performance has deteriated, then it could point to other problems - sludge in the pipework and radiators, faulty...

I wish I'd had an HE - I was one of the unlucky recipients of a Baxi Bahama ! :roll: :evil:

I had a Baxi combi fitted in my previous house and it was very unreliable - I had many of the components replaced over the years. When it came to looking into boilers for my current house, I didn't even consider them - went for a Worcester Bosch instead.

I didn't say that - I'm not the OP ! :)

Thanks for that, but I was thinking of a decorating scenario, where you want to refit the same rad and not have to remove the tails ?

Are these blanking caps a standard size, or are they specific for lockshields/TRVs ? I've struggled to find them in the past - does anyone have a suitable weblink ? Cheers.

No idea I'm afraid, but this might be useful : http://www.worcester-bosch.co.uk/index.php?fuseaction=literature.detail&con_id=255834&from_id=5029

Would getting mains cold direct to the bath tap help ? Even if the mains pressur/flow is low, at least it won't run out !

Hot water is often supplied from a (vented) cylinder in 22mm (staying with 22mm for the hot bath tap and dropping to 15mm for a sink, in my experience at least) and usually 15mm all round the house in combi systems. I've personally never seen mains cold in anything other than 15mm, but I'm a...

One of the advantages of a combi boiler is that you can get rid of the cold water tank in the loft (if your bathrooms are mains-fed). If you get a shower like that, then you'd have to keep it. http://www.mirashowers.com/onlinecatalog/shower_features.jsp?item=373316&prod_num=Elite+ST I've...

If your mains water and gas are up to it, then it really is down to your HW demands. We have two bathrooms and each currently has an electric shower, although I plan to change one to a thermostatic shower at some stage. Getting a 37kW combi should allow for a good shower and the result of...

I had a WB 37CDi combi installed last year and so far it's been great - it's pretty quiet in operation too. The only problems I'm having are with the (optional) WB wireless thermostat occasionally losing signal (might be a range/battery issue) and the condenstate pipe leaking slightly (I...

The 30kW rating refers to the hot water output so the larger the better, especially if you have 3 bathrooms. A more powerful combi will give you a better hot water flowrate and reduce the effect of having two hot water outlets open at once. For example - I went for a 37kW combi in my two...

Funnily enough, I'm having a problem with my Worcester Bosch DT10RF wireless optimising progammable thermostat (looks like a rebadged Drayton) I installed last year. The signal is periodically lost and I'm not sure why - it could be due to the fact that the boiler is in a utility room which...

Speaking from experience, I think it's fair to presume that you will be left with a mess :) You may need to re-plaster to get a smooth surface to work with and/or use battons as suggested. Also - if any of the walls are partion/stud walls, then it's also possible that they'll be very...

I think TRVs are usually fitted on the flow side, although many available these days are bi-directional so can be fitted to either side. It will probably pay for you to decide which and then stick with it for all your rads to avoid any confusion. As for getting the boiler installed, I...