API · /solarthermal-api

Solar Thermal API

healthy 3,962 Subscribers

Solar-thermal (solar hot water) maths as an API, computed locally and deterministically — the collector, sizing and storage numbers a solar installer or homeowner designs a hot-water system with. The output endpoint gives the useful daily heat a collector makes: area × the daily solar energy on it × the collector efficiency (flat-plate ~40–60 %, evacuated tubes higher), so a 40 ft² collector under 1,800 BTU/ft²/day at 50 % delivers about 36,000 BTU (10.5 kWh) — a family's hot water on a good day. The area endpoint sizes the collector for a demand: area = (daily gallons × 8.34 × the temperature rise) ÷ (irradiance × efficiency), so 60 gallons raised 70 °F needs about 39 ft² — sized for an average day with a backup heater, since a 60–80 % solar fraction is the economic sweet spot. The tank endpoint sizes solar storage at about 1.5 gallons per square foot of collector, big enough to bank a sunny afternoon without stalling the collector. Everything is computed locally and deterministically, so it is instant and private. Ideal for solar-installer and renewable-energy apps, hot-water-system design tools, home-energy calculators, and sustainability sites. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 compute endpoints. For the local solar resource use a solar-irradiance API; for pool heating use a pool API.

#solar-thermal #solar-hot-water #renewable #collector #energy #developer-tools

api.oanor.com/solarthermal-api

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Machine-readable spec so AI agents can integrate this API.

/api/solarthermal-api/openapi.json

/api/solarthermal-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy

Uptime: 100.00%; Server probes · 24h
Avg latency: 84 ms; Server probes · 24h
Subscribers: 3,962; active
Total calls: 4; last 7 days

Full status page → · 8 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

510 calls / month
2 requests / second
Hard cap (429 above quota, no overage)
510 calls/month
2 req/sec
Output + area + tank
No credit card

Starter

€4.95 /month

13,300 calls / month
6 requests / second
Hard cap (429 above quota, no overage)
13,300 calls/month
6 req/sec
Collector sizing
Email support

Pro

€16.70 /month

83,500 calls / month
15 requests / second
Hard cap (429 above quota, no overage)
83,500 calls/month
15 req/sec
Installer & design pipelines
Priority support

Mega

€50.20 /month

268,000 calls / month
36 requests / second
Hard cap (429 above quota, no overage)
268,000 calls/month
36 req/sec
Platform scale
Dedicated SLA

Built by

PremiumApi

Related APIs

Other APIs with overlapping tags.

Carbon Intensity API

Great Britain\x27s electricity grid carbon intensity as an API, from the official National Grid ESO Carbon Intensity service. Get the live national carbon intensity in grams of CO2 per kWh with its index (very low to very high), the current generation mix showing exactly how much of the grid is gas, wind, solar, nuclear, biomass, hydro, coal and imports right now (with the renewable and zero-carbon percentages worked out for you), today\x27s half-hourly intensity timeline, the carbon intensity of all 18 GB regions, the intensity and fuel mix for any UK postcode, and the gCO2/kWh emission factor of each fuel type. This is exactly the data you need to shift EV charging, heat pumps, laundry and batteries to the greenest, cheapest half-hours. Perfect for smart-home and energy apps, EV-charging schedulers, sustainability dashboards, carbon-aware computing and climate tools. Covers Great Britain. No accounts, no upstream key.

api.oanor.com/carbonintensity-api

Battery Pack API

Battery-pack design maths as an API, computed locally and deterministically — the voltage, capacity, energy, current and charge-time numbers an EV, e-bike, solar or robotics pack builder lays out a battery with. The configuration endpoint turns a series-parallel cell layout into the pack: cells in series add their voltages (the series count sets the pack voltage) and cells in parallel add their amp-hours (the parallel count sets the capacity), with the energy in watt-hours = voltage × capacity — a 13S4P pack of 3.6 V / 3.5 Ah cells is 46.8 V, 14 Ah and about 655 Wh from 52 cells, and it also reports the full-charge voltage (series × 4.2 V for Li-ion) to size the charger and BMS. The c-rate endpoint relates current to capacity both ways — give a C-rate to get the current, or a current to get the C-rate — because 1C draws or charges the whole capacity in an hour, so a 14 Ah pack at 2C is 28 A, and it returns the power if you pass the pack voltage. The charge-time endpoint gives the time to charge between two states of charge from the charge current. Everything is computed locally and deterministically, so it is instant and private. Ideal for EV and e-bike builders, solar and off-grid storage tools, robotics and drone packs, and battery-engineering apps. Pure local computation — no key, no third-party service, instant. Pack-design estimates — real cells taper on charge and sag under load. 3 compute endpoints. For runtime under a load use a battery API; for EV charging an EV-charging API.

api.oanor.com/batterypack-api

Heat Pump COP API

Heat-pump and refrigeration performance maths as an API, computed locally and deterministically — the efficiency numbers an HVAC engineer, energy auditor or heat-pump installer actually works with. The cop endpoint gives the coefficient of performance and the US EER rating from the thermal capacity and the electrical power: a unit moving 7 kW of heat on 2 kW of electricity has a COP of 3.5 (an EER of 12), meaning 3.5 units of heating or cooling for every unit of electricity — which is why a heat pump beats resistance heating, where the COP is exactly 1. The carnot endpoint gives the unbeatable ideal limit set only by the absolute temperatures — heating = Th ÷ (Th − Tc), cooling = Tc ÷ (Th − Tc) in kelvin, where heating COP always equals cooling COP plus one — and, given a real COP, the second-law efficiency that says how close the machine runs to that ceiling; the smaller the temperature lift, the higher the limit, which is why ground-source and low-temperature systems beat air-source on a cold day. The capacity endpoint turns electrical power and a COP into the delivered heating or cooling in kilowatts, BTU per hour and tons of refrigeration — the extra energy over the electricity is pulled from the outside air, ground or water. Everything is computed locally and deterministically, so it is instant and private. Ideal for HVAC and refrigeration engineers, energy auditors, heat-pump and building-performance tools, and sustainability dashboards. Pure local computation — no key, no third-party service, instant. Estimates at the stated conditions — real COP falls as the temperature lift rises. 3 compute endpoints. For room sizing use an HVAC BTU API; for moist-air properties use a psychrometric API.

api.oanor.com/heatpump-api

Steam Boiler API

Steam-boiler engineering maths as an API, computed locally and deterministically — the three numbers a boiler operator, plant engineer or steam-system designer actually works with. The boiler-hp endpoint converts a required heat output into boiler horsepower (heat ÷ 33,475 BTU/hr, the standard definition), the equivalent steam output in pounds per hour "from and at" 212 °F (34.5 lb/hr per BHP) and the output in kilowatts — a 1,000,000 BTU/hr load is about 29.9 BHP or 1,031 lb/hr of steam. The factor-of-evaporation endpoint gives the real capacity for your feedwater: the factor = (the total heat of the steam − the feedwater heat) ÷ 970.3, always greater than one because the boiler must add the sensible heat to bring water up to boiling, so a boiler rated "from and at" 212 °F actually makes less with 60 °F feedwater — which is exactly why preheating feedwater with an economiser raises capacity and saves fuel. The blowdown endpoint gives the continuous blowdown rate to hold the boiler water within its dissolved-solids limit: blowdown = steam × feedwater TDS ÷ (boiler limit − feedwater TDS), with the cycles of concentration and the blowdown as a percentage of feedwater — better feedwater means more cycles, less blowdown and less wasted hot water. Everything is computed locally and deterministically, so it is instant and private. Ideal for boiler operators, steam-plant and HVAC engineers, energy auditors, water-treatment specialists and process-engineering tools. Pure local computation — no key, no third-party service, instant. Engineering estimates — verify against the manufacturer data and local code. 3 compute endpoints. For moist-air properties use a psychrometric API; for compressed air use a compressor API.

api.oanor.com/boiler-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Solar Thermal API?

Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Solar Thermal API with the x-oanor-key header. No credit card needed for the free tier.

What's the rate limit for Solar Thermal API?

Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.

How much does Solar Thermal API cost?

Solar Thermal API has a free tier with 100 calls / month. Paid plans start at €4.95 / month with higher quotas and faster rate limits.

Can I cancel my subscription anytime?

Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.

Is Solar Thermal API GDPR-compliant?

All requests to Solar Thermal API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Solar Thermal 3

Meta 1

Pick an endpoint from the list on the left to see its details and try it.

GET /v1/area

Collector area for a demand

Playground

Parameters

Custom headers

Language: Client:

GET /v1/output

Collector daily heat output

Playground

Parameters

Custom headers

Language: Client:

GET /v1/tank

Solar storage tank size

Playground

Parameters

Custom headers

Language: Client:

GET /v1/meta

Spec

Playground

Custom headers

Language: Client:

Code snippets

curl https://api.oanor.com/solarthermal-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."

const res = await fetch("https://api.oanor.com/solarthermal-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();

$ch = curl_init("https://api.oanor.com/solarthermal-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);

import requests
r = requests.get(
    "https://api.oanor.com/solarthermal-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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Solar Thermal API

API health

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Related APIs

Carbon Intensity API

Battery Pack API

Heat Pump COP API

Steam Boiler API

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