ForHosting KIT · Developer Utilities

Boiler size calculator

Sizing a central heating boiler by guesswork either leaves rooms cold on a design-day freeze or installs an oversized unit that short-cycles, wastes fuel, and wears out sooner than a correctly matched appliance.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

This boiler size calculator turns three plain measurements—heated floor area in square metres, ceiling height in metres, and insulation quality—into the heating power in kilowatts a space needs under a transparent volume rule of thumb. Interior volume is floor area times ceiling height. That volume is multiplied by a specific heat-loss density that depends on fabric: forty watts per cubic metre for excellent insulation, fifty for good, eighty for average, and one hundred twenty for poor. Watts divided by one thousand are boiler kilowatts; the tool also rounds that figure up to a whole kilowatt so catalog nameplates are never chosen below the estimate. Use the free browser widget when comparing combi and system boilers, then call the same pure function from quoting scripts so every estimate matches this page.

How to use it

Enter your values in the form above. The tool checks them before calculating and shows the result on the same page.

Check your inputs

Use the labels and units shown next to each field. If something is missing or outside the allowed range, the page points to the field to fix.

Use it again or automate it

Use the browser tool for individual checks and the API when you need the same capability in an automated workflow.

What you can do with it

Get an answer now

Enter one set of values and see the result without building a spreadsheet or script.

Compare scenarios

Change one value at a time and rerun the calculation to understand what affects the result.

Automate repeated work

Use the API when the same calculation needs to run inside your product or workflow.

FAQ

How do I use this capability?

Complete the fields above and run it on this page. The form highlights anything that needs attention.

For developers — API access

Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.

API endpoint

POSThttps://api.kit.forhosting.com/build/boiler-size

Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.

Call it from your stack

curl -X POST https://api.kit.forhosting.com/build/boiler-size \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"floor_area":100,"ceiling_height":2.4,"insulation":"average"}'

const res = await fetch("https://api.kit.forhosting.com/build/boiler-size", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "floor_area": 100,
    "ceiling_height": 2.4,
    "insulation": "average"
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/build/boiler-size",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "floor_area": 100,
    "ceiling_height": 2.4,
    "insulation": "average"
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/build/boiler-size", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"floor_area":100,"ceiling_height":2.4,"insulation":"average"}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"floor_area":100,"ceiling_height":2.4,"insulation":"average"}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/build/boiler-size", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "floor_area": 100,
  "ceiling_height": 2.4,
  "insulation": "average"
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "build.boiler_size",
  "status": "queued",
  "_links": {
    "result": "/tasks/tsk_…/result"
  }
}

The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.

Pricing

Per request$0.002

Published price — no tokens, no invented credits. A failed task is never charged.

Errors

HTTP	Code	Meaning
`401`	`unauthorized`	Missing or invalid API key.
`402`	`insufficient_balance`	Your balance doesn't cover the task price.
`404`	`unknown_type`	That task type doesn't exist.
`429`	`rate_limited`	Too many requests. Use the webhook instead of polling.

Read the full KIT documentation →