Hi There...
Your Hardy should not be taking on water daily. If you have a leak it should be easy to find. Either there is water around your Hardy or it is in your house. If you have found the leak and it is at your Hardy's tank, you will have to drain and weld.
Besides a leak in the tank, which could be the problem... there are two very good, possible reasons for your H4 to be taking on too much water and puddling around the outside of it...
1. The Domestic Hot Water (DHW) coil inside your tank has cracked and you are leaking DHW into your tank, causing it to overfill. If the furnace ever froze up from not being fired in the winter time this is a very real possibility. It is an easy fix if so but would require the outer skin being removed.
2. The float switch is faulty and not turning off the auto-fill solenoid despite the float in the full position. The easy test for this is to ensure the valve is turned off at the solenoid. This should be in the upper right hand corner of the H4. You can remove your evaporator stack and see the float. Push it down with a stick and you should be able to hear the switch working, clicking on and off the solenoid. If you cannot hear the clicking, you have a faulty switch.
Both the two scenarios above will cause your H4 to overfill and soak the surrounding area around it. If I were you, turn off the main feed to the Hardy and see if your problem dries up. If your water level holds you have almost found your problem. My Hardy takes on water about once every 4-6 days if you want to use that as a gauge.
Ok... as for your poor heat. Your H4 should be making a sauna out of your house so I will tell you now you are having an issue. I will assume your aqua-stat is reading around between 150--170 degrees...you can see the temp of your water from the back of your H4. If it isn't, your parameters can be adjusted by the thermostat on the back of the Hardy. It is the long, gray plastic box. If however your Hardy is at appropriate temp, the first thing you should do is look at and change your furnace filter inside your house. Also, check your heat exchanger in your duct-work to ensure it is not gummed up with fuzz, lint etc. Finally, check your Pex lines to ensure none are kinked or obstructed. On your heat exchanger you have two lines, in and out. When your Taco pump is running, go to your heat exchanger and feel both lines...there should be a noticeable temp difference between the two. That would be the temp of the water going into the exchanger, and then coming out once the heat is sent into your house. Check this situation out and give me an update. Depending on your findings will help me zero you in to your issue. Either way we will get this working.
Thanks
WCA