Agreed with The Other Tim on this one, I like my helio aswell.
One thing with helio is that, like most heaters, they are very generous with their tank ranges. You want to get the next size up.
I would go with
something like this, then have another helio/other brand as a backup but set to a slightly higher temp. Doesn't need to be the same size, just something to pick up the slack in the cold basement and buy you some time. I would hook this other heater up to a wifi inkbird, so you are always aware of the temp and any issues.
I live in Canada so my basement gets very cold, so I would definitely need to go over the wattage specs and also have redundancy.