"He is a true hospice hero, just put a cape on him I say."
Mr Dawson entered the 19C loch at 6.30pm New Zealand time yesterday, his 50th birthday in New Zealand.
Ms Morgan said she understood it had also coincided with the anniversary of the day his mother was buried.
"The generosity of so many will help us purchase specialist equipment such as motorised electric beds with pressure mattresses, wheelchairs and walking frames," Ms Morgan said.
"This equipment helps our patients pass as peacefully and painlessly as possible while still holding onto their dignity."
Fewer than 50 people have made the 40km swim across Loch Lomond.
Mr Dawson has lived in England for the past 24 years.
He posted on his website that he was doing the swim in support of Rotorua Community Hospice.
"I guess we all don't think about a hospice until we need to, but the care and support they provide to our community is unparalleled, in my opinion, and I really want to show that the people of Rotorua (my home town) can and want to get behind supporting the hospice."
Fewer than 50 people have made the 40km swim across Loch Lomond.
People can follow Mr Dawson's blog at http://ironkiwi.wordpress.com or see his fundraising page at fundraiseonline.co.nz/DaveDawson.