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@chmurph2
Created September 6, 2017 19:01
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SodaStream DIY Recoup and Calculations
@tl;dr
5.3 months // how often 3 sparkling water drinkers will go through a 20 lbs CO2 tank
$90 // SodaStream
$29 // 20 lbs tank refill every 6 months, at Robert's Oxygen in Dulles, VA
$201 // initial investment in tank, refill attachments/adapter, first CO2 fill
5.4 months // time to recoup initial equipment investment (sans SodaStream)
@initial equipment costs (excluding SodaStream, which we got as a gift)
diy_tank_20lbs = $115 + $21.34 shipping // 20 lb CO2 tank
adapter_kit = $30 // kit to attach tank to sodastream bottle to refill (tubes, connectors, valves)
co2_refill = $29 // at Robert's Oxygen in Dulles
initial_diy_cost = diy_tank_20lbs + adapter_kit + co2_refill
@refill interval
refills_per_month = 2.5 // the rate 3 sparkling water drinkers go through normal sodastream bottle in our house
diy_months_until_refill = 20 lb / (1.5 lb × refills_per_month) // when we'll need to refill the DIY CO2 tank in months
@refill cost breakdown
non_diy_refill_cost_at_target = $15 // 1.5 lb CO2 bottle
non_diy_cost_per_month = non_diy_refill_cost_at_target × refills_per_month
diy_cost_per_month = co2_refill / diy_months_until_refill
diy_cost_per_sodastream_fill: diy_cost_per_month / refills_per_month
@initial equipment cost recoup
recoup_months: initial_diy_cost / non_diy_cost_per_month // months_to_recoup_initial_diy_investment
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