Hot Water Cylinder Size and Heat Pump Water Heater Savings
Wired White v1 Size a hot water cylinder from mixed-water demand, estimate heat-up time and standby loss, and compare heat-pump electricity, timer capacity and payback.
Heating and buildings
Heat load, heat-pump sizing and running cost, wall U-values and condensation, stairs: building calcs that explain their assumptions. Estimates only; they do not replace a certified calculation.
Wired White v1 
Heat Pump Buffer Tank, Low-Loss Header & Plate Exchanger Calculator
Wired White v1 Compare heat-pump hydraulic layouts, mixing and plate-exchanger temperature penalties, COP and seasonal cost. Size active water volume for minimum run time and defrost.
Heat Pump Scheduling: Always On, Setback or Cheap-Hours Preheat
Wired White v1 Compare always-on heating, night setback and cheap-hours preheat. See daily kWh, cost, cold hours and peak power with temperature-dependent COP and recovery limits.
