As a lifelong state licensed plumber that spent his whole life installing and repairing steam and hot water systems I can tell you professionally that a water heater is the very most in-efficient way to heat a building using your radiant heating system. The efficiency rating is a small percent of what a boiler is made for that purpose. But water heaters are cheaper than boilers------just so you know.
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Why in the heck did you buy a 250 ?? "Because they were all out of 175's"
"The less the merrier"
"I'm so old, I don't even buy green bananas"--Quote: Jimmy Dickens
"The older I get--the bigger my rear sprocket gets"
"It takes 12 HP to ride around the world--the rest is wheelspin"