Polaris or Rinnai

farmer

Am debating whether to use a tankless (Rinnai) or Polaris tank for DHW plus radiant floor in a slab on grade low load (35k BTU) house. I plan to separate the DHW from the radiant slab with a flat plate hx if a tank is used. Which direction makes the most sense?

Bruce_6

I

Have had very good success with the Polaris. using it for both domestic and radiant. install a heat exchanger for the radiant side to keep your domestic water seperate.

there are advantages and disadvantages with each. Each unit also requires a little knowlege in there operation to set up to run correctly.

are you installing this yourself, or hiring a professional to install it for you. if you are hiring someone,, go with what that contractor is familiar with. you will get a better system.

there is a difference between the effeciency of the unit, and the effeciency of your system as a whole.

hr

The Polaris

would be less flow sensitive, and sometimes a tank style is more desireable, depending on your DHW wants needs and desires.

I'm a little nervous about the longevity issues with those micro tube, instantanous heater heat exchangers. Time will tell.

hot rod

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Josh M.

However it would cost alot less for the rinnai without the heat exchanger and extra expansion tank and feedwater system. I really like the Rinnai system. I have installed a few in some smaller homes and I have never had a call back. The polaris on the other hand I have put several in only to have to go back and change them out!!! My opinion of them is really poor.