I started on a radiant heat effort using Uponor's Wirsbo Quik Trak system with the ultimate goal installind throughout our house. Unfortunately, living in Virginia Hampton Roads region there is not a big (none) demand for this type heating nor contractors with experience or expertise to consult. I am now at a juncture a decision needs to be made on a heat source. My initial thought was to use a boiler, based on numerous sessions I watched on This Old House. Leveraging what help & guidance that is available (mainly plumbers) they’re advocating tank-less. This year I replaced our hot water heater, outside mounted tank-less, with the intent to use that space for the boiler. Now I am not sure adequate space exist for a boiler. House is a ranch, 2,700 sq ft with a ROG. At the sametime the carpeting is being replaced stone tile. I am struggling in getting a sound analysis to address all rooms, components needed (manifolds, etc) & loops. I am well aware the sizing will ultimately determine the heat source sizing (boiler or tank-less). I am under a time constant because my permit is close to end of term and I need to resolve/decide on a heat source. Anyone experienced in the area and would/can offer some advice?