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 →
- § 13Does the sewer pipe have enough fall to the connection, or is a pump needed?Sewer fall →
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.
Tools that work in all subjects
Maths and templates that work in every trade — and at school. Every tool shows the formula and the working with your own numbers.
- Pythagorasa² + b² = c²Find the missing side, set out a right angle, check whether a room is square, and find the space diagonal.
- Area and perimeterm²Rectangle, triangle, trapezium, circle and composite shapes — area and perimeter.
- Volume and surface aream³ · lBox, cylinder, cone, sphere, pyramid, prism, pipe and frustum — also in litres.
- Percent%Percentage of, how many per cent, percentage change, discount and VAT.
- Scale and ratios1 : 50From drawing to reality, area and volume to scale, the rule of three and dividing in a ratio.
- Unit convertermm ↔ mFrom mm to km, Pa to bar and kB to GB — with the unit staircase.
- Time calculations and the clockt : minTime between two clock times, add time, and 1.75 h = 1 h 45 min for the timesheet.
- Slope and fall% · ° · 1:xFall from level to level, in per cent, per mille, degrees and mm per metre — and the height difference.
- Material consumption including wastem² + %Boards, paint, battens at c/c spacing and packs — for a composite surface or a whole room, with waste.