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The Glass Pool · WARMWASSER

Domestic hot water tank

Hot water — tank, charging and circulation. Part of the glass family — like our glass BESS, biogas plant and CHP.

Domestic hot water tank
Generator → Charging circuit → Stratified tank → Draw-off points
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What the AI does
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What is Domestic hot water tank?

The stratified tank separates generation from draw-off: hot at the top for consumption, cold at the bottom for recharging. The cleaner the stratification, the more usable volume sits in the same vessel.

Charging runs through a fresh-water station or a heat exchanger. A charging pump set too fast destroys the stratification — the tank turns lukewarm throughout instead of layered, and loses usable capacity.

What is measured here

  • Tank temperature top and bottom — the stratification itself
  • Charging power and charge duration per cycle
  • Draw-off volume via the heat meter
  • Standby loss during hours without draw-off

How we connect it — read-only

  • Tank sensors top and bottom over Modbus or from the building management system.
  • Heat meter in the charging circuit over M-Bus — energy, volume, flow and return.
  • Charging pump through its Modbus interface (speed, power).

Schematic (native, live)

Hot water — tank, charging and circulation.

GeneratorStratified tankDraw-off points

Overview: The Glass Pool → · Markets: pool markets →

Live —

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What the AI does

  • Detects destroyed stratification when top and bottom converge.
  • Places recharging in PV and low-price hours as far as the draw-off forecast allows.
  • Measures the standby loss in draw-off-free nights — the figure reveals insulation quality.
  • Flags a growing charge duration for the same energy — a sign of scaling.

Method proven on a live European reference aquatic center; presented anonymously.

Standby loss

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Estimate from metered / design values. Zero-grid-import windows are real (metered).

Standards & norms

What the rules require — Domestic hot water tank

Grounded in DIN 19643, VDI 2089, DGfdB and the German Buildings Energy Act. Same knowledge base as the European reference site; presented anonymously.

Why does stratification in the tank matter?

Only the hot upper section is immediately usable. If the contents mix, usable capacity falls even though the tank is the same size — and the reheat runs more often.

Basis: plant engineering

How do you spot a scaled heat exchanger?

Charge duration grows for the same transferred energy, and the spread in the charging circuit narrows. Both are measurable long before output visibly collapses.

Basis: plant engineering

How large is the standby loss?

It can only be measured on the actual installation: during a draw-off-free night the tank temperature drops by a specific amount, and the loss follows from that. A blanket figure would be guesswork.

Basis: plant engineering

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