11.   As a guide, gas central heating, water heaters and fires hould be services once a year.

12.   The actual water heater, the re-flueing of it.

13.   This and the water heater.

14.   To tell them not to mess about with that water heater!

15.   Right, what about the what about the water heater?

16.   Yeah, right what about the water heater?

17.   In the meantime the men have took the water heater off the wall.

18.   An insulating blanket is less cost-effective if the water heater is in a heated room, but it might help a bit.

19.   And, installation of valves and water heaters should be done by a professional.

20.   And, it is possible that the water heater itself is deteriorating, causing the excessive sediment.