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u3b3rg33k · 08-03-18, 01:35 PM

what MIGHT work and be simple (haha):
get one of those Bosch BOVA 3T or 5T ODUs, then put a coax/brazed plate exchanger indoors. they modulate from 25-110% based on load calculated by the ODU. all you'd have to do is control the water flow rate through the indoor hx to get the ODU to modulate up/down.

i've seen the 3T (0.75-3.6 ton range) available online for under $2k USD.

08-03-18, 01:35 PM	#15
u3b3rg33k Apprentice EcoRenovator Join Date: Mar 2018 Location: Rustbelt, USA Posts: 114 Thanks: 5 Thanked 10 Times in 9 Posts	what MIGHT work and be simple (haha): get one of those Bosch BOVA 3T or 5T ODUs, then put a coax/brazed plate exchanger indoors. they modulate from 25-110% based on load calculated by the ODU. all you'd have to do is control the water flow rate through the indoor hx to get the ODU to modulate up/down. i've seen the 3T (0.75-3.6 ton range) available online for under $2k USD.