Off the top of his head:
Total weekly income: About 250-300 a week (but PIP is included in that, which isn’t counted toward a lot of things) he also gets a pension on top of that, which is about £65 a week.
Benefits he receives: Benefits are ESA (contribution based), Universal Credit (heavily reduced 🙄), PIP.
Weekly Council Tax: Rent weekly is £100, council tax weekly is £25 (reduced to £13 with the support), so rent + council tax is about £113 a week.
And neither of us have children.
Okay, so because he receives PIP, he is exempt from meeting the financial requirement (£18,600 per year) and can use Adequate Maintenance instead.
So, he needs to show that:
His total weekly income (from all sources) - (rent + council tax) = at least £117.40
You'll need to find out if the council tax amount he pays will be affected by you moving into the property, as I believe you need to use the weekly council tax figure that you will pay once you have the visa, rather than what he currently pays.
Assuming for now that it's full council tax amount of £25 per week, he'd need to show that:
His weekly income = £100 + £25 + £117.40
= £242.40 or more
You can use any savings either of you have as well, so if his income doesn't quite meet this, you can top it up with the savings (which would be divided up into weekly amounts).