I have lurking here for a couple of months now and finally joined. I just picked up my Tarm Solo 40 today and cannot wait to start putting it together. I have a few questions about the installation. I have radiant floor heating in about half my house and was wondering if this is going to pose a problem and I have no idea what an oxygen barrier is? Do I need a heat exchanger? I know it more efficent with a heat storage, but I cannot afford it this year. I had a Kerr woodboiler last year and sold it this summer, the three hour burn time was not cutting it. I am going to hook this boiler in parrell with my burnham boiler. Any suggestions and tips would be appriciated. Thanks Doug