Radiant heating system:
It will have 1 high temperature zone, the upstairs bedrooms & bath.
Using 1/2" O2 barrier pexA 8" OC suspended under 3/4" Advantech subfloor including 4' loops up each side knee walls. Only need about 14 BTU/ft2 at 2*F.
Downstairs it will have 3 low temperature zones in the concrete slab (my favorite way) same pexA at same 8" OC. Slab will have 6" of type 2 EPS under & around perimeter.
The heart of my heating system is a Vie$$man 79 gal. Dual coil indirect water heater that acts as a Thermal Accumulator. The Domestic Hot Water will be drawn from the body of this tank and it acts as a buffer tank for the radiant floors.
The bottom coil will add heat into tank from Solar panels or from Burnham RV3 gas boiler.
The top coil will provide heated water for the radiant system.
The slab zones water temperature will be controlled by a Erie Boiler Boss 3000 Outdoor Reset injection pump controller (brand new in box on EBay for about 1/4 of retail)
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The TAC Erie BB3000 Injection Pump Control with outdoor reset provides accurate control of the water temperature in the secondary (radiant) loop of a heating system, using an injection pump. The BB3000 also protects against boiler condensation by monitoring and anticipating the boiler return water temperature in the primary loop. The outdoor air and loop temperatures are sequentially displayed, along with the secondary loop setpoint and injection pump speed.
Features:
Microprocessor control
Built-in transformer and relays
Real application data inputs
Large, bright display and indicators
Boiler short cycle and low temperature protection
Sure start pump control
Priority override
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It will control the speed of a Taco 006 used as the injection pump (must use a standard SPC pump) into my DIY cast iron Hydraulic Seperator (mixer) (I copied the design of the Caleffi $$)
http://s3.supplyhouse.com/manuals/13..._PROD_FILE.pdf
It is made out of cast iron tees & nipples & has an air vent on top, fine mesh Stainless steel screen rolled up in middle to elemonate air. Has a strong high temperature magnet in the drain at bottom (needed for ECM system pumps).
All 4 zones will have continuous circulation using 4 Grundfos Alpha pumps set at lowest constant speed (about 3-5 Watts) Each zone has a Tekmar PID thermostat, smart but not WIFI, wired to a Taco ZVC.
The 4 zone valves are 3-way, when OFF (thermostat is not calling for heat) water circulates within its zone to even out hotter & cooler floor areas.
When ON (thermostat calling for heat) the 3-way zone valve directs the zone's return water into the Hydraulic Seperator lower System side port. The zone valve End Switch sends a "Heat Request" to the Erie BB3000.
The injected tank hot water goes into the Hydraulic Seperator top Source port and returns to the tank via the lower Source port.
Hotter tank sourced water is mixed with the zones cool returning water & exits via the top System side port, the BB3000 uses a sensor in this pipe to control the speed of the injection pump.
The upstairs High Temperature zone does not use the ODR controlled water but pumps directly through the Heat Accumulator top coil.
BBP