Work it out.
Calculators tailored to plumbing: find the water velocity, work out the heat output, size the pump and expansion. Enter your own values — the result updates live.
What do you want to find out?
Directory
Choose the question that resembles yours — then we open the right calculator.
- § 01How fast does the water run in the pipe at a given flow rate — and is it above the guideline limit?Water velocity in pipe →
- § 02How many kW does a given flow carry at a specific ΔT between supply and return?Heat output from water flow →
- § 03How many litres of water are in the pipe — and how much per metre?Pipe content (volume) →
- § 04How much power does the pump deliver to the water — and what does it draw at the shaft?Pump power →
- § 05How long does it take to heat, say, a hot-water cylinder at a given power output?Heating-up time for tank →
- § 06How much volume must the expansion vessel be able to take up when the system heats up?Expansion volume →
- § 07How large a pressure drop does the pipe and its fittings give at a given flow — and is the speed too high?Pipe pressure loss →
- § 08How large a rainwater flow should roof downpipes and drains be dimensioned for?Roof drainage (rainwater) →
- § 09Does the hot water system's measured temperatures meet legionella requirements?Legionella temperature check →
- § 10How many watts does the radiator emit at a different mean temperature difference than the nominal?Radiator heat at ΔT →
- § 11How long does it take to heat a hot water tank from cold water to target temperature at a given power?Heating time for hot water tank →
- § 12How many metres of underfloor heating hose should I lay for a given area — and how many circuits?Floor heating hose — length and circuits →
- § V1Can I get the entire system specification — heating requirement, hot water, expansion and component selection — from my house at once?Complete plumbing system →
Step A — Flow & flow rate
The hydraulics: the velocity of the water in the pipe and how much fluid is held in the run.
Step B — Heating & energy
The energy balance: how much power the flow moves, and how long it takes to heat up.
Step C — Systems & components
Size the pump and expansion vessel from your own system and pump data.
Step D — Drainage & rainwater
Drainage of rain and wastewater: the size of the flow the drain must be able to handle according to DS 432.
Step E — Hygiene & safety
Inspection against standard requirements — e.g. legionella temperatures in hot water for use according to DS 439/BR18.
Step V — Directory
Guided inspection of the entire system at once: the house's heating needs, hot water, expansion and component selection — pure geometry on your own answers.
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