Computes a transparent planning estimate for space-heating demand
Computes a transparent planning estimate for space-heating demand. The method is not DIN, VDI, GEG or PHPP and must not be used as regulatory proof. It combines transmission heat loss from each envelope component, ventilation heat loss from heated volume and air changes, monthly heating degree days from the nearest DWD 1991-2020 temperature-normal station, stated internal gains and optional domestic hot water.
4000 (raw units)
price
1
calls / 30d
1
unique payers
2026-09-14
updated
Provider
solar.halowerk.com · discovered, not yet claimed by its owner
Payment (x402 accepts[])
[
{
"scheme": "exact",
"network": "eip155:8453",
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "4000",
"maxTimeoutSeconds": 300
}
]Output schema
{
"bazaar": {
"info": {
"input": {
"body": {
"domestic_hot_water_kwh_year": 1800,
"envelope": [
{
"area_m2": 168,
"name": "external walls",
"u_value_w_m2k": 0.22
},
{
"area_m2": 118,
"name": "roof",
"u_value_w_m2k": 0.16
},
{
"area_m2": 92,
"name": "ground floor",
"u_value_w_m2k": 0.25
},
{
"area_m2": 31,
"name": "windows",
"u_value_w_m2k": 0.95
}
],
"heated_floor_area_m2": 145,
"heated_volume_m3": 365,
"lat": 52.52,
"lon": 13.405,
"max_station_distance_km": 70,
"profile": {
"heating_base_temp_c": 15,
"indoor_temp_c": 20,
"internal_gains_w": 350
},
"system_efficiency": 0.92,
"ventilation": {
"air_changes_per_hour": 0.45,
"heat_recovery_efficiency": 0.15
}
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"examples": [
{
"domestic_hot_water_kwh_year": 1800,
"envelope": [
{
"area_m2": 168,
"name": "external walls",
"u_value_w_m2k": 0.22
},
{
"area_m2": 118,
"name": "roof",
"u_value_w_m2k": 0.16
},
{
"area_m2": 92,
"name": "ground floor",
"u_value_w_m2k": 0.25
},
{
"area_m2": 31,
"name": "windows",
"u_value_w_m2k": 0.95
}
],
"heated_floor_area_m2": 145,
"heated_volume_m3": 365,
"lat": 52.52,
"lon": 13.405,
"max_station_distance_km": 70,
"profile": {
"heating_base_temp_c": 15,
"indoor_temp_c": 20,
"internal_gains_w": 350
},
"system_efficiency": 0.92,
"ventilation": {
"air_changes_per_hour": 0.45,
"heat_recovery_efficiency": 0.15
}
}
],
"properties": {
"domestic_hot_water_kwh_year": {
"default": 0,
"maximum": 1000000,
"minimum": 0,
"type": "number"
},
"envelope": {
"items": {
"additionalProperties": false,
"properties": {
"area_m2": {
"maximum": 100000,
"minimum": 0.1,
"type": "number"
},
"name": {
"maxLength": 80,
"minLength": 1,
"type": "string"
},
"u_value_w_m2k": {
"maximum": 8,
"minimum": 0.01,
"type": "number"
}
},
"required": [
"name",
"area_m2",
"u_value_w_m2k"
],
"type": "object"
},
"maxItems": 40,
"minItems": 1,
"type": "array"
},
"heated_floor_area_m2": {
"maximum": 100000,
"minimum": 5,
"type": "number"
},
"heated_volume_m3": {
"maximum": 1000000,
"minimum": 10,
"type": "number"
},
"lat": {
"description": "Latitude in Germany; the DWD normal dataset used here covers Germany.",
"maximum": 56,
"minimum": 47,
"type": "number"
},
"lon": {
"maximum": 16,
"minimum": 5,
"type": "number"
},
"max_station_distance_km": {
"default": 80,
"maximum": 200,
"minimum": 1,
"type": "number"
},
"profile": {
"additionalProperties": false,
"properties": {
"heating_base_temp_c": {
"default": 15,
"maximum": 25,
"minimum": 0,
"type": "number"
},
"indoor_temp_c": {
"default": 20,
"maximum": 30,
"minimum": 5,
"type": "number"
},
"internal_gains_w": {
"default": 0,
"maximum": 100000,
"minimum": 0,
"type": "number"
}
},
"type": "object"
},
"system_efficiency": {
"default": 1,
"maximum": 1.5,
"minimum": 0.5,
"type": "number"
},
"thermal_bridge_w_k": {
"default": 0,
"maximum": 100000,
"minimum": 0,
"type": "number"
},
"ventilation": {
"additionalProperties": false,
"properties": {
"air_changes_per_hour": {
"default": 0.5,
"maximum": 5,
"minimum": 0,
"type": "number"
},
"heat_recovery_efficiency": {
"default": 0,
"maximum": 0.95,
"minimum": 0,
"type": "number"
}
},
"type": "object"
}
},
"required": [
"lat",
"lon",
"heated_floor_area_m2",
"heated_volume_m3",
"envelope"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
}Use it
curl
curl "https://solar.halowerk.com/building-heat-demand" # -> 402 Payment Required, accepts[] lists how to pay # retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid
JavaScript
const res = await fetch("https://solar.halowerk.com/building-heat-demand");
if (res.status === 402) {
const { accepts } = await res.json();
// pay one of accepts[] via an x402 client, then retry with the payment header
}Python
import httpx
res = httpx.get("https://solar.halowerk.com/building-heat-demand")
if res.status_code == 402:
accepts = res.json()["accepts"]
# pay one of accepts[] via an x402 client, then retry with the payment headerMachine-readable
Everything on this page is also available as clean JSON at /resources/15428.json, and this resource appears in /discovery/resources and /discovery/search.