J.R. Baker Associates Inc.....est 1965
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Wilo Eco Stratos and Danfoss 2 Watt Zone Valve
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You just bought a high efficiency boiler to save money...right? Why would you take the money you just saved
and give it right back to the utility? Until now, our industry has promoted the use of circulators as the most
reliable method of delivering heat to a building. Even though we may use several types and sizes of circulators,
it is safe to assume that you can average their power consumption at 100 watts. So if you have a system with 5
zones(using circulators) and all zones are calling for heat, you are consuming 1/2 Kw or 500 watts! Remember
your parents telling you to turn the lights off? So if you are considering installing a high efficiency boiler to save
of the use of the Wilo ECO Stratos is the ability to control your system Delta T(differential temperature). In order
for your boiler to reach stated efficiencies and your system to "give off" the heat expected, there should be a 20
degree difference in temperature from the supply to the return, this cannot happen when using standard "on/off"
circulators to control temperature. Now, the zone valve. There are many available to the trade, all with varying
capacities and power consumption requirements. The Danfoss TWA 4400 series comes in sizes to handle 80%
of todays projects and consumes only 2 WATTS! A hidden benefit of the TWA 4400 is the slow opening
actuator, this helps eliminate water hammer and associated expansion and contraction noises. Lets look at the
same 5 zone system we discussed earlier(500 watts with circulators...), when using the ECO Stratos and the
Danfoss TWA 4400 and all 5 zones are calling you have a maximum of 59 watts on the circulator, 2 watts per
zone valve X 5 valves(10 watts) for a total system side consumption of 69 watts, an 86 percent electrical
savings!!! In addition, we can show you how to set up the system and "dial in" the evasive 20 degree differential
that will make your boiler and system deliver the maximum efficiency possible. Contact us for further details on
how these products help gain all the efficiency possible out of your system.

