The Pex Pipes and Hydronic Distribution Installation will not heat your home alone, you need to add a heat source.
The easiest, most common heat source is an on-demand water heater, rated for radiant in-floor heating.
These come in 2 main options: Electric and gas (both propane and natural gas)
The average new home, built to code, with in-floor heating as the only source of heat, in Minnesota, requires about 22-25 BTUs per square foot to keep warm. The gas heaters are rated by BTUs. If your house fits these criteria: take your square footage times by 25 BTUs for total BTUs needed.
For electric water heaters, using the same criteria, you will need about 7kw for every 1,000 sq ft of heated space.
It is Easy to do a dual fuel and/or off peak heating with HUG Hydronics in-floor heating system.