Hot Water Circulation
Hot water the moment the tap opens — without running the pump all day.
A hot water line that is not circulating goes cold between uses, so the first thirty seconds at every tap go down the drain. The usual fix is to run the circulation pump continuously, which keeps the water hot and quietly burns energy around the clock. A monitored loop does neither: it watches the return temperature and runs the pump only when the loop actually needs it.
Hot water circulation system · heat pump monitoring · temperature automation
What makes it work
The parts of the diagram above that are doing the real work.
Adaptive circulation — it runs on flow, not on a clock
A flow sensor in the hot line tells the controller the moment somebody actually opens a tap. The circulation pump starts on that signal and stops shortly after the draw ends. You wait a second or two longer than you would with a loop running around the clock — and in exchange the pump and the standing heat loss stop for most of the day. It is a small compromise in luxury for a large one in energy.
Schedules on top of it
Even adaptive circulation has hours nobody needs it. Set the windows your building actually wants hot water — mornings and evenings for a home, longer for a hotel — and outside them the loop is simply off. No pump run-hours and no standing loss overnight.
The heat source in the same plan
Heat pumps and geysers are monitored on the same platform, so charging the storage vessel and circulating the loop are two halves of one decision rather than two machines competing over the same tank.
How it is done
Every step below is a retrofit on the system you already have — no replacement pumps, no civil work.
- 1
Sense the loop, not the clock
A temperature sensor on the return leg tells the controller what the loop is actually doing. That is the difference between a circulation system and a timer that happens to run a pump.
- 2
Run the pump on demand
When the return drops below your comfort band the circulation pump runs; when the loop is hot again it stops. Comfort at the tap without the pump running all day.
- 3
Coordinate the heat source
Heat pumps and geysers are monitored on the same platform, so charging the storage vessel and circulating the loop are two parts of one plan instead of two machines fighting over the same tank.
- 4
See it and set it from the app
Loop temperature, setpoint and heat-source state are live in the app, with schedules for the hours your building actually wants hot water.
What it takes
- Temperature sensors on the storage vessel and the return leg
- Circulation pump on an APCON controller
- Heat pump or geyser, monitored on the same platform
- The Devyami app for setpoints, schedules and live loop temperature
What you get
- Hot water at the tap in seconds, not after a minute of waiting
- Water saved that used to be run off cold while waiting
- Circulation pump run-hours cut against continuous running
- Heat source and loop coordinated instead of competing
Questions, answered
Does a circulation pump have to run continuously? ＋
No — and it should not. Running it around the clock keeps the loop hot but wastes both pump energy and standing heat loss. A monitored loop watches the return temperature and runs the pump only when the loop has actually cooled, which gives the same experience at the tap for a fraction of the run hours.
Can this work with my existing geyser or heat pump? ＋
Yes. The circulation pump and its sensors are what get controlled; your existing heat source stays, and is monitored on the same platform so the two work to one plan.
The rest of the system
Every capability runs on the same controllers, the same app and the same live data.
Accurate Tank Level Monitoring
Two ways to read a tank — non-contact ultrasonic on the lid, or a contact hydrostatic level transmitter hanging in the water. Both report live percent and litres, warn you before an overflow or an empty tank, and feed the same reading the controller switches your pumps on.
How it is done →Digital Flow Monitoring & Water Metering
Digital flow meters turn every pipeline into a number you can manage: litres pumped today, consumption per wing or per site, and totals you can export. Water metering is also your leak detector — flow at 3 AM when everyone is asleep is a leak announcing itself.
How it is done →Pump Status, Control & Protection
Every pump shows its truth in the app: running or stopped, current, voltage and run hours — and a Start/Stop that works from anywhere. Underneath, the APCON motor driver protects against dry run, overload, phase failure and voltage faults, whether or not your phone is in the room.
How it is done →HPN & Multi-Pump Pressure Systems
Hydro-pneumatic (HPN) systems keep constant pressure across a whole building: pumps cascade in as demand rises, rotate duty so they wear evenly, and stand by for each other. A pressure transmitter on the header puts live line pressure in the app — lead/lag status, pressure trends and every changeover.
How it is done →Timer & Scheduler — Irrigation & Fountains
Garden irrigation, landscape zones and fountains run to a schedule you set once from your phone: start time, run duration, which days, which zone. The controller keeps time locally, skips a cycle when the tank is too low to spare the water, and logs every run.
How it is done →Want hot water circulation on your site?
Tell us what your pump room looks like today — we design, retrofit and stand behind the whole system.