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									Solar Water Heaters - Plumbing Talks Forum				            </title>
            <link>https://www.plumbingtalks.com/community/solar-water-heaters/</link>
            <description>Plumbing Talks Discussion Board</description>
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            <lastBuildDate>Sat, 07 Nov 2026 01:25:47 +0000</lastBuildDate>
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							                    <item>
                        <title>Limited roof space for solar hot water</title>
                        <link>https://www.plumbingtalks.com/community/solar-water-heaters/limited-roof-space-for-solar-hot-water/</link>
                        <pubDate>Thu, 29 Oct 2026 01:21:12 +0000</pubDate>
                        <description><![CDATA[With limited roof area, how do you decide whether to use it for a solar-thermal collector loop or PV panels powering a heat-pump water heater? I’m curious how roof orientation and partial sh...]]></description>
                        <content:encoded><![CDATA[With limited roof area, how do you decide whether to use it for a solar-thermal collector loop or PV panels powering a heat-pump water heater? I’m curious how roof orientation and partial shade affect the comparison, and whether one option is more forgiving when the available roof space isn’t ideal.

The systems also seem to bring different changes indoors: solar thermal needs its collector loop and storage, while the PV route means electrical integration and a heat-pump water heater. How do backup heating, plumbing or electrical work, and ongoing maintenance compare in practice? I’m especially interested in the likely failure points and what makes one setup a better fit for a household’s hot-water use, without assuming either will automatically cost less over its lifetime.]]></content:encoded>
						                            <category domain="https://www.plumbingtalks.com/community/solar-water-heaters/">Solar Water Heaters</category>                        <dc:creator>running507</dc:creator>
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				                    <item>
                        <title>How much does partial shade matter on a solar-thermal roof?</title>
                        <link>https://www.plumbingtalks.com/community/solar-water-heaters/how-much-does-partial-shade-matter-on-a-solar-thermal-roof/</link>
                        <pubDate>Tue, 27 Oct 2026 12:20:43 +0000</pubDate>
                        <description><![CDATA[How would you weigh a roof face with better orientation but some shade against a less-shaded face that points less ideally? I’m especially curious whether shade during the stronger midday su...]]></description>
                        <content:encoded><![CDATA[How would you weigh a roof face with better orientation but some shade against a less-shaded face that points less ideally? I’m especially curious whether shade during the stronger midday sun usually matters more than shade limited to early morning or late afternoon, and how much that depends on the collector type and seasonal sun path.

The actual roof direction and the timing and extent of nearby shadows seem important, so I wouldn’t want to judge from a rough “south-facing is best” rule alone. What measurements or modeling would you ask an installer to provide for each location, and how should the comparison account for expected hot-water output across the year?]]></content:encoded>
						                            <category domain="https://www.plumbingtalks.com/community/solar-water-heaters/">Solar Water Heaters</category>                        <dc:creator>kevans81</dc:creator>
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				                    <item>
                        <title>Drainback can avoid glycol, but how forgiving is the layout?</title>
                        <link>https://www.plumbingtalks.com/community/solar-water-heaters/drainback-can-avoid-glycol-but-how-forgiving-is-the-layout/</link>
                        <pubDate>Sun, 25 Oct 2026 18:36:31 +0000</pubDate>
                        <description><![CDATA[A drainback system avoids antifreeze, but that benefit depends on the collector loop draining reliably whenever the pump stops. Glycol systems keep fluid in the collector loop through cold w...]]></description>
                        <content:encoded><![CDATA[A drainback system avoids antifreeze, but that benefit depends on the collector loop draining reliably whenever the pump stops. Glycol systems keep fluid in the collector loop through cold weather, so they trade that drainage requirement for periodic checks of the fluid condition and the loop for leaks.

How much does local freeze severity change which approach makes sense? I’m also curious how installers establish that a drainback loop can empty completely, and what routine service each system typically needs. Which failure risk would matter more in practice: a drainback pump or drainage problem, or deteriorated glycol that hasn’t been caught in time?]]></content:encoded>
						                            <category domain="https://www.plumbingtalks.com/community/solar-water-heaters/">Solar Water Heaters</category>                        <dc:creator>dfurry48</dc:creator>
                        <guid isPermaLink="true">https://www.plumbingtalks.com/community/solar-water-heaters/drainback-can-avoid-glycol-but-how-forgiving-is-the-layout/</guid>
                    </item>
				                    <item>
                        <title>How should roof-work allowances be handled in a solar water-heater quote?</title>
                        <link>https://www.plumbingtalks.com/community/solar-water-heaters/how-should-roof-work-allowances-be-handled-in-a-solar-water-heater-quote/</link>
                        <pubDate>Sat, 24 Oct 2026 03:43:20 +0000</pubDate>
                        <description><![CDATA[If one solar water-heater quote includes a roof-access allowance or possible structural work while another leaves those items conditional, what would you ask to make the estimates comparable...]]></description>
                        <content:encoded><![CDATA[If one solar water-heater quote includes a roof-access allowance or possible structural work while another leaves those items conditional, what would you ask to make the estimates comparable? I’d want to know what inspection findings would actually justify reinforcement, and whether access equipment, permits, or roof repairs are included or just provisional.

How should unused allowances be credited, and how should any extra work be priced and approved before it starts? I don’t want to assume every roof needs reinforcement, but I also don’t want a low quote that leaves necessary work unclear.]]></content:encoded>
						                            <category domain="https://www.plumbingtalks.com/community/solar-water-heaters/">Solar Water Heaters</category>                        <dc:creator>dobbycollector8871</dc:creator>
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				                    <item>
                        <title>How often do solar collectors need cleaning?</title>
                        <link>https://www.plumbingtalks.com/community/solar-water-heaters/how-often-do-solar-collectors-need-cleaning/</link>
                        <pubDate>Thu, 22 Oct 2026 02:58:39 +0000</pubDate>
                        <description><![CDATA[I’m unsure how often solar water-heating collectors actually need cleaning, and whether the right approach depends on the collector type. Would dust or leaves on a glazed flat-plate collecto...]]></description>
                        <content:encoded><![CDATA[I’m unsure how often solar water-heating collectors actually need cleaning, and whether the right approach depends on the collector type. Would dust or leaves on a glazed flat-plate collector matter differently from deposits on evacuated tubes? I wouldn’t want to scrub the glazing or disturb seals and roof connections just to chase a possible drop in hot-water output.

What visual signs of a leak or damaged seal should prompt a service call, and how much should the manufacturer’s instructions guide cleaning methods and timing?]]></content:encoded>
						                            <category domain="https://www.plumbingtalks.com/community/solar-water-heaters/">Solar Water Heaters</category>                        <dc:creator>cosplayer59</dc:creator>
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				                    <item>
                        <title>Solar water-heater quotes need to spell out the roof work</title>
                        <link>https://www.plumbingtalks.com/community/solar-water-heaters/solar-water-heater-quotes-need-to-spell-out-the-roof-work/</link>
                        <pubDate>Tue, 20 Oct 2026 10:43:52 +0000</pubDate>
                        <description><![CDATA[A quote for just the collector and storage tank can look very different from one that includes the work needed to connect and commission the whole system. What scope details matter most when...]]></description>
                        <content:encoded><![CDATA[A quote for just the collector and storage tank can look very different from one that includes the work needed to connect and commission the whole system. What scope details matter most when comparing prices?

I’d want to know whether removal and disposal of the old system are included, and whether roof penetrations and any needed structural checks or repairs are covered. The plumbing and electrical changes, connection to the backup heater, and commissioning should be clear too. If any of those are excluded or listed as allowances, how do you judge whether the quote is still comparable?

I’d also ask who’s responsible for the roof and plumbing warranties if the solar installation affects either. Are there other exclusions that tend to cause surprises later?]]></content:encoded>
						                            <category domain="https://www.plumbingtalks.com/community/solar-water-heaters/">Solar Water Heaters</category>                        <dc:creator>artist86</dc:creator>
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				                    <item>
                        <title>Does a drainback loop need a particular roof-pipe layout?</title>
                        <link>https://www.plumbingtalks.com/community/solar-water-heaters/does-a-drainback-loop-need-a-particular-roof-pipe-layout/</link>
                        <pubDate>Sun, 18 Oct 2026 01:12:57 +0000</pubDate>
                        <description><![CDATA[How do people weigh a drainback solar water heater against a glycol loop when freezing weather is a concern? I understand the basic distinction is that a drainback system relies on water dra...]]></description>
                        <content:encoded><![CDATA[How do people weigh a drainback solar water heater against a glycol loop when freezing weather is a concern? I understand the basic distinction is that a drainback system relies on water draining out of the collectors and exposed piping, while a glycol loop uses antifreeze fluid, but I’m unsure how much the practical choice depends on the installation.

Does a drainback system need the roof piping and collector placement arranged so every section can empty reliably, and what happens if power fails while it’s operating? For a glycol loop, what routine checks or servicing should a homeowner expect, and does a power outage change its freeze protection? I’d be interested in how local freeze risk and roof layout affect the trade-off, rather than assuming either design is maintenance-free.]]></content:encoded>
						                            <category domain="https://www.plumbingtalks.com/community/solar-water-heaters/">Solar Water Heaters</category>                        <dc:creator>Steadymaker2014</dc:creator>
                        <guid isPermaLink="true">https://www.plumbingtalks.com/community/solar-water-heaters/does-a-drainback-loop-need-a-particular-roof-pipe-layout/</guid>
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				                    <item>
                        <title>Electric or gas backup for inconsistent solar hot water?</title>
                        <link>https://www.plumbingtalks.com/community/solar-water-heaters/electric-or-gas-backup-for-inconsistent-solar-hot-water/</link>
                        <pubDate>Sun, 20 Sep 2026 13:27:53 +0000</pubDate>
                        <description><![CDATA[I’m trying to compare backup-heating options for a solar water heater, especially for a household of four with peak demand around 6–8 a.m. and again in the evening. The system would be in a ...]]></description>
                        <content:encoded><![CDATA[I’m trying to compare backup-heating options for a solar water heater, especially for a household of four with peak demand around 6–8 a.m. and again in the evening. The system would be in a cool, partly cloudy climate with flat-plate collectors and a roughly 80-gallon storage tank, so solar output could vary quite a bit through the year.

The existing backup is electric resistance heating. The options I’m considering are keeping that setup, adding a larger or faster electric element, or changing the backup to gas. Electric seems simpler because the tank and plumbing are already arranged for it, and it may avoid combustion venting. Gas might recover the tank faster after several showers, but I’m concerned about installation complexity, standby losses, ventilation, and whether its operating cost and emissions would undermine the point of installing solar.

For people who’ve sized or troubleshot systems like this:

- How do you estimate the backup capacity needed for morning and evening peaks rather than just total daily usage?
- Is it usually better to let electric backup run during off-peak hours, or use gas for faster recovery?
- Does a large electric element risk making the system rely on backup too often during marginal weather?
- Are there control settings that prioritize solar and only enable backup below a certain tank temperature?

I’m mainly trying to maintain reliable hot water without paying for a backup arrangement that erases the expected savings from the collectors.]]></content:encoded>
						                            <category domain="https://www.plumbingtalks.com/community/solar-water-heaters/">Solar Water Heaters</category>                        <dc:creator>bstar25</dc:creator>
                        <guid isPermaLink="true">https://www.plumbingtalks.com/community/solar-water-heaters/electric-or-gas-backup-for-inconsistent-solar-hot-water/</guid>
                    </item>
				                    <item>
                        <title>Comparing solar water heating with a conventional replacement</title>
                        <link>https://www.plumbingtalks.com/community/solar-water-heaters/finally-ditched-my-old-heater-for-a-greener-option/</link>
                        <pubDate>Wed, 09 Jul 2025 06:31:46 +0000</pubDate>
                        <description><![CDATA[How would you compare solar water heating with replacing an existing conventional water heater?

I’m interested in the complete proposal: collector type (including thermosiphon systems), sui...]]></description>
                        <content:encoded><![CDATA[How would you compare solar water heating with replacing an existing conventional water heater?

I’m interested in the complete proposal: collector type (including <a href="https://bsesc.energy.gov/energy-basics/hvac-thermosiphon-solar-water-heaters" rel="noopener noreferrer nofollow">thermosiphon systems</a>), suitable roof area, storage, backup heat, installation and ongoing service. An advertised reduction in energy use isn’t the same as a guaranteed reduction in a particular household’s bills.

DOE’s <a href="https://bsesc.energy.gov/energy-basics/water-heaters-solar" rel="noopener noreferrer nofollow">solar water-heating guidance</a> distinguishes solar water heating from other equipment. What information would an installer need to make a useful estimate for the property, and which ongoing costs belong in the comparison?]]></content:encoded>
						                            <category domain="https://www.plumbingtalks.com/community/solar-water-heaters/">Solar Water Heaters</category>                        <dc:creator>hwilson99</dc:creator>
                        <guid isPermaLink="true">https://www.plumbingtalks.com/community/solar-water-heaters/finally-ditched-my-old-heater-for-a-greener-option/</guid>
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				                    <item>
                        <title>solar-powered hot showers - flat plate or evacuated tubes?</title>
                        <link>https://www.plumbingtalks.com/community/solar-water-heaters/solar-powered-hot-showers-flat-plate-or-evacuated-tubes/</link>
                        <pubDate>Mon, 07 Apr 2025 00:47:38 +0000</pubDate>
                        <description><![CDATA[Been thinking about finally ditching my old electric water heater and going solar. Did a bit of digging around, and it seems like the two main contenders are flat plate collectors and evacua...]]></description>
                        <content:encoded><![CDATA[Been thinking about finally ditching my old electric water heater and going solar. Did a bit of digging around, and it seems like the two main contenders are flat plate collectors and evacuated tube collectors. Honestly, I'm still kinda fuzzy on which one would be better for everyday use.

Flat plates seem simpler, cheaper, and pretty sturdy from what I've read. I mean, fewer moving parts usually means less headaches down the road, right? But then again, people say they aren't as efficient in colder weather or cloudy days. And winters here can get pretty gloomy sometimes.

Evacuated tubes, on the other hand, look like some futuristic sci-fi gadget (which is kinda cool, lol). They're supposed to be way more efficient, especially when it's chilly or cloudy. But I've also heard they're pricier upfront and maybe a bit more fragile. Not sure how true that is though - anyone had experience with them breaking easily?

A buddy of mine installed flat plates a couple years ago and swears by them, but he's in Arizona where it's sunny like 360 days a year (lucky guy). I'm in a place with actual seasons - hot summers but cold winters too - so I'm not sure his advice applies to me.

If you've tried either of these setups yourself or know someone who has, I'd love to hear your thoughts. Is the extra efficiency of evacuated tubes worth the higher cost? Or should I just keep things simple with flat plates?]]></content:encoded>
						                            <category domain="https://www.plumbingtalks.com/community/solar-water-heaters/">Solar Water Heaters</category>                        <dc:creator>markpilot</dc:creator>
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