no loop – domestic hot water,(Is there a HWATT by RayChem?) Home › Forums › Archives › Old Bulletin Board Archives › no loop – domestic hot water,(Is there a HWATT by RayChem?) This topic has 0 replies, 1 voice, and was last updated 22 years, 6 months ago by graham aspinall. Viewing 0 reply threads Author Posts 13 Aug 1998 at 11:02 pm #281016 graham aspinall Is there a no loop – domestic hot water heater called HWATT by RayChem? Author Posts Viewing 0 reply threads The forum ‘Old Bulletin Board Archives’ is closed to new topics and replies.