I expect it wasn't particularly warm but the Victorians who were enthusiastic about water-related lore may have been a tad more resilient than us pampered moderns. At any rate the source is http://www.malvernwaters.com/nationalparks.asp?search=yes&p=7&id=261
"According to the Rev J Barrett in his guide book of 1803 the well was popular amongst the country folk for drinking and applying externally. The water, which "had a long and old fame for healing the eyes"[8] was collected by an embankment to form a large bath[9] and a small building alongside the well allowed sufficient room for one person to rest and take the healing waters, the temperature of which on 12 April 1845 was noted to be 48.5 degrees F."
I wouldn't want to bathe in that temperature but I'm impressed with the Rev's attention to detail.
No such word as 'wielm' exists in English. Does Brian Smith say how he found it?
Something is not right. This message is just to keep things from messing up down the road