At the end of the day we're talking about a device that simply 'heats water'. It's not an aeroplane or a car train or bus that lifes depend on. It's not rocket science.
http://www.bbc.co.uk/news/uk-england-lincolnshire-32194305
http://www.dailymail.co.uk/news/art...rns-suspected-gas-explosion-ripped-house.html
nah no rocket science involved at all. this is more like a rocket. and no gas needed either,
you could try pimlico
http://www.pimlicoplumbers.com/charges