We are about to do some work on our home we are considering changing the heating source from propane to electric as electric is now 30 percent cheaper per therm than propane. Propane was cheaper when we built the house. The main house is 1200 square feet with in floor(concrete) radiant. We ran it the first winter with a 50 gallon hot water tank until the propane went in. There are only two of us. We can move the tankless propane heater to the guest house to heat water for the bathroom that will be there. I don't have a heat load analysis yet but this is a SIP home. I would like to here what those here would use if they were doing this in their home.

Maybe I need to clarify. I am looking on suggestions as what to go with.

Tank heater?
Boiler?
Combi heater?

Looking for electrical solutions.

A couple of questions, How large is your electrical service, do you have a need for cooling in the summer months. If the answer is yes to my second question then you may want to consider a Daikin Altherma system which could heat your water, provide heat to the radiant, cool your home and has the ability to add solar thermal . Not cheap but a very good product.

No cooling. We have no more than two or three days in the summer where we can not get it cool enough at night to make it through the day. Electrical service is 200 amps. We still could consider that though as someone else in the future may want air conditioning. I would like to consider all the options.

what are your electric rates, and what is your heat load?

R-1 Farm and Residential Service
Service Charge: $15.00 per month
Energy Charge per KWH: $0.05063

No heat load done( built the house 10 years ago)

missed that, sorry.

with your likely heat load and electric rate I'd be inclined to say a basic electric boiler, perhaps with indirect if you want to keep amperage down or separate electric WH, would be a good choice.

altherma would be "cost disadvantaged" in that case... KWH rate is very low and heat load is very low already. However it would roll cooling in which is worth something.

Any suggestions on brands or models?

we sell and like the Electro series. minis are cheap, larger ones can come with reset built in.

What size propane heater are you using, What is your connected load on your 200 amp panel.

I use a Takagi TKJR ranges from 19000 to 140000 BTU's.It very rarely runs in the high range.