instantaneous water heater
Enable an AI agent to recognise an instantaneous water heater, assess its ability to meet a hot-water demand, and determine which operating or service actions its condition permits.
Bundle → Layer → Finding → Questions Filled
6 bundles · 11 layers · 19 findings · 31 questions
Flow-through identity Establishes what makes the appliance instantaneous and where its function begins and ends.
Heating path
Identifies how incoming water acquires heat while passing through the appliance.
Primary production mechanism
Record evidence that flow-through heat addition is the primary production method, including any auxiliary retained water.
- What component transfers heat to the flowing water, and what energy source supplies it? definition
- Does any internal reservoir primarily supply stored hot water or serve an auxiliary buffering function? boundary
Appliance boundary
Separates the heater's function from connected fixtures and other heating functions.
Standalone and combined functions
Identify whether instantaneous water heating belongs to a dedicated appliance or an identifiable section of a combined device.
- Is this a dedicated water heater, an integrated heated fixture or the domestic-water section of a combined appliance? boundary
- Which diagram or manufacturer description establishes the heater's inlet, outlet and included control components? provenance
Hot-water delivery envelope Relates useful heat output to inlet conditions, water flow and requested outlet temperature.
Thermal capacity
Makes performance claims conditional on the water and energy conditions under which they apply.
Flow and temperature capacity
Record delivery points or curves with their test conditions rather than treating a maximum flow claim as universal.
- At what inlet temperature, temperature rise and supply conditions is each stated delivery flow achieved? measurement
- Can the documented useful output meet the intended simultaneous outlet demand at the lowest expected inlet temperature? action
Activation and transients
Captures behaviour at low flow, startup and changing demand.
Minimum demand and temperature response
Identify activation thresholds and distinguish appliance temperature response from delivery delays in downstream pipework.
- What flow starts heating, what flow sustains it, and under which conditions were those thresholds established? measurement
- When temperature varies after startup or a demand change, which part of the response originates inside the heater and which in the distribution system? boundary
Demand control and protection Describes how the heater recognises demand, regulates heat and responds to unsafe or abnormal conditions.
Heat regulation
Connects sensed demand and temperature to the appliance's available heat-control actions.
Demand-to-heat control
Record demand sensing, user settings and modulation or staging without assuming every heater maintains a selected temperature.
- Which flow, pressure or temperature signals enable heating and determine its intensity? definition
- Which documented user adjustments can address the observed delivery problem within the appliance's operating limits? action
Protective states
Identifies installed safeguards and the conditions for shutdown, reset or service.
Protection and restart evidence
Record applicable protections, such as overtemperature, inadequate water flow, electrical faults or combustion failure, only where supported for the design.
- Which protective devices are documented, and which observed indication identifies the active shutdown or lockout? provenance
- What documented conditions must be satisfied before a user reset, qualified service intervention or return to operation is permitted? action
Installation and conformity Connects the heater's water and energy interfaces to evidence that an intended installation is compatible.
Water and energy interfaces
Records supply and connection constraints specific to the heater configuration.
Connection compatibility
Establish required water pressure, outlet arrangement and energy supply, including combustion interfaces where relevant.
- Is the appliance intended for an open-outlet or closed-outlet installation, and what connected fittings or restrictions does its manual permit? boundary
- Do measured water and energy supply conditions satisfy the documented requirements under heating demand? measurement
- For a fuel-fired design, what evidence establishes compatibility of the installation location, combustion-air provision, exhaust route and any condensate connection? provenance
Applicability and commissioning
Ties standards, marks and installation checks to a specific appliance class and jurisdiction.
Verified installation basis
Require traceable applicability evidence rather than assuming that a familiar mark or standard covers every instantaneous heater.
- Which standards and issuing bodies apply to this energy source, appliance class and jurisdiction, and what edition or effective date is relevant? provenance
- Which product documents support any claimed certification or conformity mark, and what does that evidence cover? provenance
- Which commissioning checks remain necessary before this installation can be treated as ready for use? action
Water-path condition and service Relates heat-transfer and flow-path condition to performance loss and permitted maintenance.
Degradation diagnosis
Separates capacity limitations from changes in the heater's condition.
Delivery loss evidence
Compare current flow, temperature and fault observations with documented or previously measured behaviour before attributing a cause.
- How have inlet pressure, water flow, temperature rise and fault indications changed under comparable demand conditions? measurement
- What inspection or service evidence supports scale, an obstructed inlet filter, corrosion or a control fault as the cause? provenance
Service and seasonal exposure
Captures approved cleaning, component service and protection during freezing conditions or extended disuse.
Permitted service and preservation
Link maintenance and preservation actions to the applicable manual, water conditions and dependencies of any installed freeze protection.
- What cleaning or descaling method, consumables and service criteria does the manufacturer permit for this water path? action
- What draining or freeze-protection provisions apply, and which rely on continued electricity, fuel or other installation conditions? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these check these first hold for the sense of instantaneous water heater this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these kinds and varieties hold for the sense of instantaneous water heater this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these identifiers and schemes hold for the sense of instantaneous water heater this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these standards and regulation hold for the sense of instantaneous water heater this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these real-world use hold for the sense of instantaneous water heater this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these typical measurements hold for the sense of instantaneous water heater this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these failure modes and hazards hold for the sense of instantaneous water heater this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these regional variation hold for the sense of instantaneous water heater this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of instantaneous water heater this model covers, and on what evidence? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.OBJ
What it is Filled
An instantaneous water heater is a device that heats water as it flows through the device, using an electric heating element or fuel-fired heat exchanger rather than maintaining a tank of stored hot water.
In scope
- Flow-through heating principle and distinction from storage-based water heating
- Electric or fuel-fired heating arrangements and their supply requirements
- Delivered temperature and flow under specified inlet and demand conditions
- Flow activation, heat modulation, operating states and protective shutdowns
- Appliance water connections, installation constraints and service needs
- Evidence of applicable conformity, commissioning and maintenance
Out of scope
- Manufacturer product lines and individual appliance records as separate catalogue concepts
- Building-wide hot-water distribution, circulation and storage systems
- Upstream electricity, fuel and water supply infrastructure
- Space-heating boilers except the instantaneous domestic-water function of a combined appliance
- Fixture mixing valves and outlet fittings except their interfaces with the heater
- Detailed installation procedures belonging to the applicable product manual and local requirements
Why it exists Filled
Enable an AI agent to recognise an instantaneous water heater, assess its ability to meet a hot-water demand, and determine which operating or service actions its condition permits.
Distinguishing features Filled
- Its primary hot-water production heats a moving water stream instead of drawing principally from a maintained reservoir of hot water.
- Its ability to meet demand must be assessed using flow rate and inlet-to-outlet temperature rise together, rather than storage volume alone.
- A hot-water demand initiates or enables heating through the appliance's demand-detection arrangement; the activation threshold must be established for the design.
- It adds heat to water rather than merely mixing, circulating or dispensing water heated elsewhere.
- Its defining output is heated water; an instantaneous domestic-water section within a combined boiler must be distinguished from the boiler's space-heating function.
What robots and AI may and may not do Filled
Must not
- Raise outlet temperature to a level that can scald, especially where children or older people bathe.
- Disable temperature limiters, flame safeguards or earth protection.
- Install or repair gas or mains electrical connections without a qualified person.
- Run a gas heater in a room without the ventilation or flue it requires.
Only with a human decision
- Any work on gas supply, flue or fixed electrical wiring.
May
- Monitor flow, temperature and faults on a heater it is authorised to manage.
- Set outlet temperature within safe limits chosen by the household.
- Remind the user of servicing and descaling needs.
Moral aspects Filled
- Hot water safety matters most for the people least able to react to scalding.
Who is affected
- Household members
- Installers and service technicians
- Neighbours in shared buildings
Owners Filled
Steward
The owner of the property; registered installers answer for safe installation.
Links to other meta-models Filled
parent
- Q16630809 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.instantaneous-water-heater
- Wikidata: Q5953359 (https://www.wikidata.org/wiki/Q5953359)
Direct properties required Filled
- Heating energy source: Electric resistance; specified fuel-fired type; other documented mechanism
- Rated input and useful heating output: kW, recording input and output separately with rating conditions
- Water temperature rise: K, with inlet temperature, outlet temperature and water flow in L/min
- Heating activation and sustaining flow: L/min for activation and continued heating, separately where specified
- Temperature regulation method: Fixed or staged heat input; modulating temperature control; other documented arrangement
- Permitted water pressure: kPa or bar, distinguishing operating limits and test conditions
- Water-side connection arrangement: Closed-outlet pressure-rated; open-outlet or vented; other documented arrangement
- Electrical or fuel supply requirements: Required supply specification, including applicable voltage, phase, current, fuel type and fuel pressure
- Combustion air and exhaust arrangement: Documented intake, exhaust and indoor or outdoor installation classification; not applicable to non-combustion types
- Operating and protection state: Idle; demand detected; heating; capacity-limited; protective shutdown; fault lockout; isolated; unknown
- Water quality compatibility: Manufacturer limits linked to measured hardness and other specified water properties
- Physical installation envelope: Dimensions and required clearances in mm; mass in kg; specified mounting orientation
Recognition required Filled
- A compact wall-mounted unit near the point of use, without a storage tank.
- Gas models have a flue outlet; electric models have a heavy-duty supply cable.
Capabilities and actions required Filled
- Classify a candidate appliance as instantaneous, storage-based or a combined arrangement using documented operating evidence.
- Compare a required flow and temperature rise with the appliance's documented delivery envelope.
- Check compatibility with water pressure, supply capacity, connected outlets and applicable exhaust arrangements.
- Interpret low-flow cycling, temperature shortfall and protective shutdown using observed conditions and documented controls.
- Identify permissible user adjustments and distinguish them from installation or service actions requiring qualified personnel.
- Assemble missing commissioning, conformity and maintenance evidence before recommending operation or return to service.
Hazards and failure modes required Filled
- Scalding from excessive outlet temperature.
- Carbon monoxide from poorly vented gas units.
- Electric shock or fire from faulty wiring or overheating.
Standards and interfaces required Filled
- IEC 60335-2-35, Household and similar electrical appliances, Particular requirements for instantaneous water heaters, International Electrotechnical Commission.
Context of use required Filled
- Instantaneous water heaters supply hot water on demand in homes, commercial premises and facilities with localized washing needs.
- They may serve one outlet or several outlets, with suitability depending on available energy supply, incoming water temperature and simultaneous demand.
Sources Filled
- Wikidata item Q5953359: instantaneous water heater - identity and sense of the item
- Wikipedia: Tankless water heating - general description of the item
Open questions
- Which existing Vercy world model, if any, already owns this concept or its parent water-heater concept and should be linked instead of duplicated?
- Where should the registry boundary fall for small-buffer tankless designs, heated taps and instantaneous domestic-water sections of combined boilers?
- Which primary sources establish the applicable standards, issuing bodies and certification requirements for electric and fuel-fired variants in the intended jurisdictions?
- What sourced capacity, activation-flow, pressure and dimension ranges are representative of point-of-use and whole-building variants under explicit rating conditions?
- Which documented failure patterns and water-quality limits justify common diagnostic questions across variants, and which must remain manufacturer-specific?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q5953359/spec.json