The strainers are 100 micron, paper filters are 20 micron. You can get elements to fit your filter bodies, and I recommend you fit one next to the boiler. The pump is set at about 110psi or more, and so dust from the baffles will not block the nozzle.
I now don't belive the problem is nozzle blockage.
Is your new house really 3500sq in? I see you live in the land of the little people, but I didn't think they were that small. I suggest a small blowlamp or even a large cigarette lighter.
However, assuming you're just trying to keep the inland revenue in the dark about your wealth, I would think the multi zone systems around might be worth looking at. There are a few about, so you could choose your own. For the boiler, these are almost always far too big for the building. I could never say any particular unit is the best on the market, they all have good and not so good points, and the Stanley is no exception.
Work out how much the heat losses are going to be on your house, then draw a graph of the mode temperature of the outside through the year and pick a temperature that's common rather than an extreme low. See how much heat you need to keep the house warm at this temperature (say 70-72 F) Then see what temp it will be at the extreme low. 60 to 65 would be ok in my opinion.I don't subscribe to the view that the heating should be able to keep the temperature at 70 high something, with the outside at well below freezing for a few days a year.
This will give you a size of boiler which will be working most of the time, rather than off most of the time. Have the pipes big enough too. If someone is designing it for you, ask what the maximum heat flow for the pipe size is, as most installations have pipes that can't take the heat away from the boiler as fast as the boiler can produce it. So why have the boiler?
For the few days when you need more heat, use a wood burning stove, much more cosy (or put another jumper on). (I wood say these
are among the best).
If your house needs huge amounts of heat, more than 40kW, you can look at waste oil boilers by Kroll UK, but you need a low pressure air supply too.
I would have more than one heat source plumbed into the system, so you could have a Stanley cooker and a standard boiler (which could be a fairly small boiler). This
is the unit for linking parts of the system.
Next I would consider using a thermal store (Albion, Gledhill and others). This stores the heat at low pressure, and allows you to have mains pressure hot water. (Not necessarily a good choice). Its great advantage if you care to configure it, is you can have radiators that don't go from hot to cold to hot, but you could use a variable speed pump to continuously vary the heat delivered so the radiators stay warm, the boiler then tops up the heat store.
I think that's enough for now, most of these thoughts are not the run of the mill installations, but those are usually a less than satisfactory cost driven solution to a critical system in a house.