I am in the process of installing a new (to me) Garn 2000 in a remote building about 150ft from my house. I need help with the plumbing and electrical diagrams. I was in touch with Chris Holley and he did the heat load calculations, and recommended depressurizing my current system because the height of the Garn is about midway between the lower and upper level of my house. I asked Chris to help with the system design (for a fee of course) but its been a bit of radio silence since September. I understand the basics but I want to spend the time and money of having a proper design so I am not re-plumbing or buying fittings, pumps, etc twice. Background: Garn is 2009, I purchased the digital controller, gaskets set, chemicals, had my water tested, Logstor 1.25 insulated underground Pex installed between house and barn. Stainless class A chimney installed vertical inside the barn, intake air damper, etc all per Garn manual. I have an oil fired boiler with 3 zones, 1 zone is indirect fired Hot water tank. other 2 zones are HWBB for upper and lower level. Chris also recommended moving the two ciculators for HWBB to supply side. I have a little more baseboard then required for my heat load and should be able to use storage temp down to 135. What controls are used for the Oil Burner in the event that the storage temp on the Garn is too low? Does anyone run their system depressurized? Do you have plumbing schematics and electrical schematics? Thank you.