Long story but I am now refurbishing a cloakroom as well as a bathroom earlier than expected because it was 50% of the cost to take our new shower bath as part of an on offer set including washbasin and wc than singularly! The cloakroom is upstairs in a chalet bungalow and the washbasin is too high in relation to the water tank to take it's hotwater supply from the gas central heating system hot water supply . We have therefore always used a small over basin point of supply electric heater supplied from the rising main. As part of the refurbishment I should like to improve on this by fitting a Heatrae Sadia Streamline electric heater below the washbasin. This implies using a Heatrae Sadia vented tap. The washbasin is yet to be delivered by Homebase but is a pedestal ceramic single tap design. I note from the Homebase catalogue that the tap hole is nominally 35mm. The Heatrae Sadia monoblock vented tap (streamline 1000) which would otherwise be suitable requires a 37 - 39 mm hole according to the Heatrae Sadia website. Obviously I don't want to order the waterheater and tap if the problem is a real one but it occurs to me that Heatrae Sadia would not produce taps that didn't fit standard basin sizes and the 35mm is nominal only?
Can anyone advise?
Peter