How to choose Towel Rails for an ASHP

Renewables345 · 2025-09-16T09:28:08Z

Hi all, I'm struggling a bit here. I am currently quoting up my first ASHP job. I have done the heat loss which comes out at 10.6kW. There is a bathroom which has a heat loss of 570 watts and a WC with a 400 watt heat loss. The bathroom currently has a 1m wide by 0.5m high towel rad, and can only go up to 0.6 high. In the WC it is 1m high and 0.6m wide. These don't match the outputs necessary but I can't find any which will even get close to fit in the space. What would you do in this scenario and is there anywhere you would recommend buying your towel rads from? Thanks

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Air Source Heat Pumps (ASHPs)

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Old_Scientist

(@old_scientist)

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16/09/2025 4:58 pm

We are lucky enough to have space in both our bathrooms to accommodate a conventional K2 radiator to heat the room and a towel radiator for drying towels. In summer we resort to drying towels the old fashioned way by hanging them outside. The additional heat output provided by the towel radiator allows a slightly smaller K2 than otherwise would have been required to meet the MCS recommendation.

Samsung 12kW gen6 ASHP with 50L volumiser and all new large radiators. 7.2kWp solar (south facing), Tesla PW3 (13.5kW)
Solar generation completely offsets ASHP usage annually. We no longer burn ~1600L of kerosene annually.

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GrahamF

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16/09/2025 5:55 pm

@rob-nezard yes absolutely. Here is the link and a photo:

https://www.stelrad.com/radiators/towel-rail-radiators/designer-towel-rails/slimline-towel-rail-designer-towel-rails/vertical-ultra-2/

Grant Aerona 290 15.5kW, Grant Smart Controller, 2 x 200l cylinders, hot water plate heat exchanger, Single zone open loop system with TRVs for bedrooms & one sunny living room, Weather compensation with set back by room thermostat based load compensation

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Judith

(@judith)

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21/09/2025 8:43 pm

In one en-suite bathroom we have a 180cm high towel rail which isn’t enough wattage really, but the bedroom donates plenty of heat.

In another we simply added an extra small radiator and in a 3rd a towel rail (dual fuel) to add to ufh. But we’ve never need to add in an electrical time slot to supplement heat, even in summer when the heating is off.

I had indigestion with the price of the taller high area ones since we needed two going that route.

2kW + Growatt & 4kW +Sunnyboy PV on south-facing roof Solar thermal. 9.5kWh Givenergy battery with AC3. MVHR. Vaillant 7kW ASHP (very pleased with it) open system operating on WC

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GrahamF

(@grahamf)

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22/09/2025 7:38 am

@judith

Posted by: @judith

↑

I had indigestion with the price of the taller high area ones since we needed two going that route.

Yes I agree. They are extremely expensive. I suspect they sell very few of them, so they don’t have the economies of scale of standard radiators. The 14 week lead time on coloured ones is painful too.

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