Spoke to customer upon arrival. Expressed concern about tankless water heater not working. Found gas being pulled from radiant Heater. Also combination vent with radiant flooring. Causing tankless to starve itself of gas, causing gas control valve to malfunction. Explained to customer the best option would be a combination boiler. That will also do radiant flooring heating and domestic hot water customer went ahead with the estimate. Customer gave half down. And would like to green sky, the rest of the amount.