Privacy policy

Who runs WattMaths

WattMaths is run by Sithum Imarsha. In this policy, "I" and "me" mean Sithum.

This page explains what information WattMaths handles, who else sees it, and the choices you have.

Your calculator inputs

The calculators run in your browser. The maths happens on your own device. WattMaths does not send your inputs to me, and I don't store them.

Your inputs are saved in the page address (the link in your browser's address bar). That is how share links work. Anyone you give the link to can see the inputs in it. Like any page address, it stays in your browser history until you clear it.

The heat pump hot water calculator asks for your postcode. It is used only to pick your climate zone. It also goes into the share link, like your other inputs. Keep that in mind before you post a link in public.

Two services that load the page can also see its address. Cloudflare hosts the site. Google's ad code loads on every page once ads are on.

There are no accounts, no sign-up forms and no newsletter. WattMaths sets no cookies of its own and saves nothing in your browser's storage.

Hosting

Cloudflare serves WattMaths. Like any web host, Cloudflare handles your IP address (the network address of your device) to deliver pages to you and to protect the site from attacks. If Cloudflare needs to check that you are not a bot, it may set a short-lived security cookie.

Read Cloudflare's privacy policy

Analytics

I use Cloudflare Web Analytics to count visits, so I can see which pages people use. It works without cookies, and it doesn't track you across other websites. I see totals, such as page views, not individual people.

How Cloudflare Web Analytics works

Ads and cookies

WattMaths is paid for by ads from Google AdSense. Google's ad code runs on the page, so it can see the page address, including any calculator inputs in it.

• Third-party vendors, including Google, use cookies to show ads based on your earlier visits to this website or other websites.
• Google's advertising cookies let Google and its partners show you ads based on your visits to WattMaths and other sites.
• You can turn off personalised ads in Google Ads Settings.
• You can opt out of some other ad companies' cookies at aboutads.info or youronlinechoices.com.
• Google may also let other ad companies it has certified show ads here. Google publishes the list of these companies.
• You can also block or delete cookies in your browser settings.

If you are in the European Economic Area, the UK or Switzerland, Google shows you a consent message before any personalised ads. You can change your choice later through the privacy settings link that Google's message provides. In some US states, Google's message may also let you opt out of ad personalisation.

How Google uses information from sites that use its services

Email

If you email me, your message is stored by my email provider. I use your address and message only to reply to you. I don't sell or share them, and there is no mailing list.

You can ask me to delete your messages at any time.

Your choices and rights

The only personal information I hold myself is the email you send me. You can ask what I hold about you, or ask me to delete it. Email me at hello@wattmaths.com. Wherever you live, you can make a privacy request this way.

For ads, use the choices in Ads and cookies above.

If you are in Australia and not happy with my answer, you can complain to the Office of the Australian Information Commissioner (OAIC).

Children

WattMaths is for adults making decisions about their home. It doesn't knowingly collect information from children.

Changes to this policy

If I change how WattMaths handles your information, I'll update this page and the "Last updated" date at the top.

Contact

Questions about this policy? Email me at hello@wattmaths.com, or see the contact page.