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Condensing and Non condensing tankless, WITH Secondary (CONDENSING and Non…
Condensing and Non condensing tankless, WITH Secondary
CONDENSING and Non Condensing tankless water heater combo system, with secondary (or buffer tank over 7.6 L)
Select boiler, and energy source, gas or propane only. Under output capacity select Calculated, do not change eff or units, use default flue diameter, Make and model if default values not known.If EF is = to or more than.9, select "condensing." If EF less than .9 select most appropriate type with no pilot
Go to DHW section, use same energy source as boiler unless it's a solar system
Tank type, use "instantaneous (condensing)" or just "instantaneous."
make a new h2k file, click Combo Heating DHW, use same energy source as boiler,
Select appropriate volume, and note the default EF.
Go back and give the instantaneous tank from original the user specified EF from the temporary H2k. Use 0 for flue diameter. Put in the manufacturers field the EF.
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If Non Condensing, usually select "heater with induced draft fan."
tankless water heater combo system, no secondary, CONDENSING and NON Condensing
Select boiler and fuel type, gas or propane only. If EF is = to or more than 90 select condensing. If less than .9 select Induced draft boiler
Use Calculated for output capacity. and use flue diameter default value. Do not change efficiency values. Input make and model if default values won't be used
In tree, go to DHW , use same energy source as boiler.
Tank type, use Instantaneous (condensing) or "Instantaneous"
Fill in EF with User Specified that you got from the unit in the house, or default if not known.
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So remember with these scenarios, you're modelling a tank as well as the boiler, even though there isn't one in the house. This is just a workaround. You do NOT use the "open a new file and use the Combo heat/DHW scenario, because there is no secondary tank.
storage tank water heater combo system (condensing and non condensing), so the house heat and dhw all comes from one tank.
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Combo systems that use a boiler--DO NOT use the Combo heating DHW system in H2k, except to model the DHW portion if it has indirect tank. Boiler and DHW have to be modelled separately.
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So, whenever there's a tank, always make a temp h2k file and use the Comb Heat/DHW button.