"Just because they have [heaters], does not mean [tenants] will necessarily use them."
The standards should be "more defined", Whitburn said, who estimates the cost of fitting houses with the new requirements would be less than $1000.
"Older, run-down properties need these standards, however heating is not an issue in all homes."
He suggested a better way to address health concerns was making sure homes had breathability through weep holes and air circulation.
Whitburn said overall the new standards were good for landlords and tenants, creating "hot, healthy and happy homes".
However, property investors were "feeling pain" due to numerous government regulations against landlords, which were also forcing up rents, Whitburn said.
New insulation standards will be in force from July 1, requiring rental properties to be fitted with underfloor and ceiling insulation.
Whitburn, who has been in the property industry since January 2002, said some landlords were finding it much harder to operate than it used to be.
"Unfortunately, we have seen a few more investors drop out of the market."