Thiking of getting a combi boiler,however I am told that this type of boiler is a "one thump boiler"is this true If a bath is filling upstairs, tap down stairs cannot be used...

If a bath is filling upstairs, tap down stairs cannot be used at the same time?
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Answers:    Yes you are right.

A combi is a one tap boiler, but you can put as plentiful taps as you like on the circuit, but you will solely get a full flow from one at a time.

If somebody runs the bath, you enjoy to wait before you compress the sink.

But they are only suitable for small places and this is not really a problem, you just hold to learn to live with it.

The merely real problem with them is if you are running a shower and somebody else turns a hit on downstairs, the shower stops running just as you are going to wash the soap from your eyes.

No fun that.

But adjectives systems have this same problem to a greater or lesser level.

So go ahead and get a combi, as long as you take in they have limitations , they are very correct.