South Wales fire service said it was called to about 75 grass fires on Tuesday.
Grass fires burning in the Brecon Beacons National Park are described as the worst seen in 30 years.
Mr Whyte said the type of firefighting vehicle planned for Windsor would typically only deal with bin and grass fires.
BBC: Windsor Fire Station 'too small' fire engine criticised
Firefighters in Cumbria have dealt with a spate of grass fires, despite some parts of the county still being under several feet of snow.
The Berkshire Fire Brigades Union (BFBU) said the proposed vehicle for Windsor was just a "souped-up van" and only deal with bin and grass fires.
BBC: Windsor Fire Station 'too small' fire engine criticised
Highlands and Islands Fire and Rescue Service recorded the acreage of several of the most serious of the 73 heath and grass fires its crews have tackled.
Following two grass fires over the Easter weekend, arson reduction team staff, police and youth workers will visit Maesgeirchen in Bangor on Thursday to get the message across.
Incidents began on 18 March with 21 grass fires in Carmarthenshire, four in Ceredigion, 42 in Neath Port Talbot, 24 in Pembrokeshire, 26 in Powys and 69 in Swansea.
In the past week at least 20 grass and gorse fires have been tackled, with some being blamed on arsonists.
Cumbria Fire and Rescue Service has dealt with more than 50 deliberate grass and gorse fires over the past two weeks.
Firefighters in Wales say they hope to see prosecutions after tackling about 300 grass and gorse fires since 1 May, many started deliberately.
Cumbria Fire and Rescue Service has dealt with more than 50 deliberate grass and gorse fires over the past two weeks and has blamed the increase on youngsters on holiday from school.
"Current initiatives include the Wales Arson Reduction Strategy which focuses attention on the main arson problems in Wales, such as grass and mountain fires which cause such widespread destruction to flora and fauna and disruption to communities, " said the spokesman.
Too many cattle feed upon the grass and too many fires have burned it.
In north Wales over the Easter weekend there were 11 deliberate fires of which three were grass blazes.
Ranchers had planned on using the grass to feed cattle... and the fires also destroyed miles of fences that keep the cattle in.
In north Wales there were 11 deliberate fires over the Easter weekend of which three were grass blazes.
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