So I purchased from Ebay a Rinnai water heater and it arrived! It is an older model but to be honest Bertha is over 20 years old.
Gary my LPG Gas-Safe engineer came round to fit it and first of all it was a matter of transferring over fittings – all good.
Then putting the vent pipe on – oops the heater is slightly longer – it fitted.
Time to test and we kept our fingers crossed – hurrah hot water into the sink it works, how excited was I ?
The best of all is that the shower works with good pressure and is hot as well – double bonus. Now all I have to do is flush through the tanks with the appropriate solution and away we go – I am so pleased.